Bump handlebars from 4.0.10 to 4.7.7 in /generator-exercise

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.0.10 to 4.7.7.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.10...v4.7.7)

Signed-off-by: dependabot[bot] <support@github.com>

generator-exercise/package-lock.json

@@ -66,23 +66,12 @@
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-      "dev": true,
-      "optional": true,
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-        "longest": "^1.0.1",
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       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
+      "dev": true,
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     "ansi-escapes": {
       "version": "1.4.0",
@@ -493,13 +482,6 @@
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-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
-      "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
-      "dev": true,
-      "optional": true
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@@ -511,17 +493,6 @@
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-      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
-      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
-      "dev": true,
-      "optional": true,
-      "requires": {
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     "chalk": {
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -580,27 +551,6 @@
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-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
-      "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
-      "dev": true,
-      "optional": true,
-      "requires": {
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-        "right-align": "^0.1.1",
-        "wordwrap": "0.0.2"
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-          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
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       "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.1.tgz",
@@ -1636,31 +1586,36 @@
       "dev": true
     },
     "handlebars": {
-      "version": "4.0.10",
+      "version": "4.7.7",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.0.10.tgz",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.7.tgz",
-      "integrity": "sha1-PTDHGLCaPZbyPqTMH0A8TTup/08=",
+      "integrity": "sha512-aAcXm5OAfE/8IXkcZvCepKU3VzW1/39Fb5ZuqMtgI/hT8X2YgoMvBY5dLhq/cpOvw7Lk1nK/UF71aLG/ZnVYRA==",
       "dev": true,
       "requires": {
-        "async": "^1.4.0",
+        "minimist": "^1.2.5",
-        "optimist": "^0.6.1",
+        "neo-async": "^2.6.0",
-        "source-map": "^0.4.4",
+        "source-map": "^0.6.1",
-        "uglify-js": "^2.6"
+        "uglify-js": "^3.1.4",
+        "wordwrap": "^1.0.0"
       },
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+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
           "dev": true
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         "source-map": {
-          "version": "0.4.4",
+          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
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+        "uglify-js": {
+          "version": "3.13.5",
+          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.13.5.tgz",
+          "integrity": "sha512-xtB8yEqIkn7zmOyS2zUNBsYCBRhDkvlNxMMY2smuJ/qA8NCHeQvKCF3i9Z4k8FJH4+PJvZRtMrPynfZ75+CSZw==",
           "dev": true,
-          "requires": {
+          "optional": true
-            "amdefine": ">=0.0.4"
-          }
         }
       }
     },
@@ -3045,13 +3000,6 @@
         "is-buffer": "^1.1.5"
       }
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-      "resolved": "https://registry.npmjs.org/lazy-cache/-/lazy-cache-1.0.4.tgz",
-      "integrity": "sha1-odePw6UEdMuAhF07O24dpJpEbo4=",
-      "dev": true,
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       "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
@@ -3116,13 +3064,6 @@
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       "dev": true
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-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
-      "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true,
-      "optional": true
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     "loose-envify": {
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       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.3.1.tgz",
@@ -3318,6 +3259,12 @@
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       "dev": true
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+    "neo-async": {
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+      "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.2.tgz",
+      "integrity": "sha512-Yd3UES5mWCSqR+qNT93S3UoYUkqAZ9lLg8a7g9rimsWmYGK8cVToA4/sF3RrshdyV3sAGMXVUmpMYOw+dLpOuw==",
+      "dev": true
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     "node-int64": {
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       "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -3739,30 +3686,6 @@
       "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
       "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k="
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-      "integrity": "sha1-2j6nRob6IaGaERwybpDrFaAZZoY=",
-      "dev": true,
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-          "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=",
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-          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
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@@ -4229,16 +4152,6 @@
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-      "integrity": "sha1-YTObci/mo1FWiSENJOFMlhSGE+8=",
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@@ -4857,40 +4770,6 @@
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@@ -5090,13 +4969,6 @@
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