update .gitignore out/ for intellij (#2756)

diff --git a/.gitignore b/.gitignore
index 1291f31..f65f024 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,7 @@
 .idea
 *.class
 *.iml
+out/
 
 # Ansible
 ansible/environments/docker-machine/hosts