Add code coverage related files to .gitignore.

Author: desrosj

.gitignore

@@ -48,7 +48,10 @@ wp-tests-config.php
 /artifacts
 /setup.log
 /coverage
+/codecov
+codecov.*
 wordpress.zip
+wp-code-coverage-*.zip
 
 # Files and folders that get created in wp-content
 /src/wp-content/blogs.dir