Move update_version.sh to contrib/

Change-Id: I26218cd512a739fc26ba04be05f01260152d785f
diff --git a/.gitignore b/.gitignore
index a0c4088..ad9b423 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,7 @@
 __pycache__
 pid
 .*.sw?
-version
+.version
 _version.py
 tags
 set_pythonpath