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Update README.md 

Having to change 'xit's in exercises like repeatString for testing exercise solutions was not immediately obvious. I felt it should be mentioned so newbies before me won't face confusing jasmine messages about xits when testing their code.

I don't know how the wording of the readme is really intended, so I hope my change will address this properly.
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@ -11,7 +11,7 @@ Before you start you should have a few things installed on your machine:
1. NodeJS. To check if you have it type `node -v` in a terminal. If you get back a number bigger than `6` that means you've got it installed. Best way to install node is with NVM. Check link for instructions [here](https://github.com/creationix/nvm#install-script)
2. Jasmine. Jasmine is a testing framework for Javascript. Type `jasmine -v` to check for it. If you need to install it type `npm install -g jasmine` to do so.
Each exercise includes 3 files, a markdown file with a description of the task, an empty (or mostly empty) javascript file, and a set of tests. To complete the exercise go to the exercise directory in a terminal and run `jasmine filename.spec.js`. This should find and run the test file and show you the output. Upon first running the tests you will find that the tests fail: this is by design! Your task is to open up the javascript file and write the code needed to get all of the tests to pass.
Each exercise includes 3 files, a markdown file with a description of the task, an empty (or mostly empty) javascript file, and a set of tests. To complete the exercise go to the exercise directory in a terminal and run `jasmine filename.spec.js`. This should find and run the test file and show you the output. Upon first running the tests you will find that the tests fail: this is by design! Your task is to open up the javascript file and write the code needed to get all of the tests to pass. Some of the exercises have test conditions defined in the spec file that are defined as 'xit' compared to 'it'. This is purposeful, and as you test your solution against the first 'it', on success you will change the next 'xit' to an 'it' and test your code again, until all conditions are satisfied.
The first exercise, `helloWorld` will walk you through the process in more depth.