Fix line endings in README.md

[christianvuerings]

What kind of change does this PR introduce?
Line endings fix for README.md

Did you add tests for your changes?
No

If relevant, did you update the README?
Yes

Summary
For more info see https://help.github.com/articles/dealing-with-line-endings/#per-repository-settings

Does this PR introduce a breaking change?
No

[codecov-io]

Codecov Report

Merging #416 into master will not impact coverage.

@@           Coverage Diff           @@
##           master     #416   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files           9        9           
  Lines         304      304           
  Branches       67       67           
=======================================
  Hits          299      299           
  Misses          5        5

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[bebraw]

Can you rebase so we can get the change in? Thanks.

[joscha]

@bebraw see #444