Add .idea to .gitignore

Change-Id: I961da85ae841645be0bdf1c8760402e05e0194de
diff --git a/.gitignore b/.gitignore
index 436c408..d1c5cdb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 ChangeLog
 dist/*
 *.egg*
+.idea