Update README.md (avoid linebreak)

[ci skip]

Author: ByteCommander

README.md

@@ -5,7 +5,7 @@ A Python2 and Python3 cross-version API for talking to Stack Exchange chat.
 
  - Supported Python versions (Travis-CI build passes):  
     <kbd>2.6</kbd> <kbd>2.7</kbd> <kbd>3.2</kbd> <kbd>3.3</kbd> <kbd>3.4</kbd> <kbd>3.5</kbd> <kbd>3.5-dev</kbd>  
- - Unclear versions (Travis-CI build fails because of the packages we use for our Travis-CI tests only):  
+ - Unclear versions (Travis-CI build fails because of the packages we use for our Travis-CI tests):  
     Those Python versions are always built by Travis-CI, but the result is ignored in the summary.  
     <kbd>3.6-dev (nightly)</kbd> because of package `coverage` (see [link](https://bitbucket.org/ned/coveragepy/issues/391))