Fix deploy_brew rule to be compatible with Python 2 (typedb#289)

## What is the goal of this PR?

Allow running `deploy_brew` with Python 2 being active system-wide

## What are the changes implemented in this PR?

Fix "TypeError: list object is not an iterator" error by making an iterator out of a list

brew/templates/deploy.py

@@ -30,7 +30,7 @@
 
 
 def get_distribution_url_from_formula(content):
-    url_line = next(filter(lambda l: l.lstrip().startswith('url'), content.split('\n')))
+    url_line = next(iter(filter(lambda l: l.lstrip().startswith('url'), content.split('\n'))))
     url = url_line.strip().split(' ')[1].replace('"', '')
     return url