Updated testing section in readme.

README.md

@@ -96,7 +96,7 @@ In order to truly test the parser output, regression testing is needed. The
 tests for this parser are located in
 **/cp2k/parser/parser-cp2k/cp2kparser/regtest**. Tests provide one way to test
 each parseable quantity and python has a very good [library for unit
-testing](https://docs.python.org/2/library/unittest.html).  When the parser
+testing](https://docs.python.org/2/library/unittest.html). When the parser
 supports a new quantity it is quite fast to create unit tests for it. These
 tests will validate the parsing, and also easily detect bugs that may rise when
 the code is modified in the future.