updated change log

Author: DonJayamanne

CHANGELOG.md

@@ -1,6 +1,6 @@
 ### Version 0.6.8 (03 July 2017)
 * Add new editor menu 'Run Current Unit Test File' [#1061](https://github.com/DonJayamanne/pythonVSCode/issues/1061)
-* Changed 'mypy-lang' to mypy [#930](https://github.com/DonJayamanne/pythonVSCode/issues/930), [#998](https://github.com/DonJayamanne/pythonVSCode/issues/998)
+* Changed 'mypy-lang' to mypy [#930](https://github.com/DonJayamanne/pythonVSCode/issues/930), [#998](https://github.com/DonJayamanne/pythonVSCode/issues/998), [#505](https://github.com/DonJayamanne/pythonVSCode/issues/505)  
 * using "Python -m" to launch linters [#716](https://github.com/DonJayamanne/pythonVSCode/issues/930), [#9716](https://github.com/DonJayamanne/pythonVSCode/issues/923), [#1059](https://github.com/DonJayamanne/pythonVSCode/issues/1059)
 
 ### Version 0.6.7 (02 July 2017)