Tests fail on windows

Line endings:

```
CodeTracking.jl: Test Failed at C:\Users\Kristoffer\.julia\environments\v1.1\dev\CodeTracking\test\runtests.jl:24
  Expression: src == "function f1(x, y)\n    # A comment\n    return x + y\nend\n"
   Evaluated: "function f1(x, y)\r\n    # A comment\r\n    return x + y\r\nend\r\n" == "function f1(x, y)\n    # A comment\n    return x + y\nend\n"
```