Merge pull request #138 from rspec/fix_markdown_files

Rename code_of_conduct.md to CODE_OF_CONDUCT.md

Author: JonRowe

common_markdown_files/code_of_conduct.md renamed to common_markdown_files/CODE_OF_CONDUCT.md

@@ -1,7 +1,7 @@
 # Contributing
 
 RSpec is a community-driven project that has benefited from improvements from over over *500* contributors.
-We welcome contributions from *everyone*. While contributing, please follow the project [code of conduct](code_of_conduct.md), so that everyone can be included.
+We welcome contributions from *everyone*. While contributing, please follow the project [code of conduct](CODE_OF_CONDUCT.md), so that everyone can be included.
 
 If you'd like to help make RSpec better, here are some ways you can contribute: