Update gitignore

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1421957 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.gitignore b/.gitignore
index 6d92b9b..26f04c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@
 velocity.log
 maven-eclipse.xml
 .externalToolBuilders
+.idea/