Update JetBrains.gitignore

Global/JetBrains.gitignore

@@ -1,4 +1,4 @@
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
 
 ## Directory-based project format
 .idea/