Modify example

This is useless in Python 3, but it avoids Python 2 users getting an
error when trying the example.

This fixes jxmorris12#18.

Author: myint

README.rst

@@ -18,7 +18,7 @@ From the interpreter:
 
 >>> import language_check
 >>> tool = language_check.LanguageTool('en-US')
->>> text = 'A sentence with a error in the Hitchhiker’s Guide tot he Galaxy'
+>>> text = u'A sentence with a error in the Hitchhiker’s Guide tot he Galaxy'
 >>> matches = tool.check(text)
 >>> len(matches)
 2