Ignore .pyc files.

Now that we have python code in the repo, we should ignore .pyc files.

Bug: None
Test: no untracked files after running ./paycheck.py

Change-Id: I32cd49c0a9a46d887c4a205ef1c52d4be6b96382
diff --git a/.gitignore b/.gitignore
index d6dd317..ced5927 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@
 /update_engine.dbusserver.h
 /update_engine_client
 /update_engine_unittests
+*.pyc