Make hooks.verbose=false actually work

Previously, the function "lower" from the string object returned from
running `git config hooks.verbose` would be compared with the string
'false'. Unfortunately, this results in verbose-mode always being
enabled.

Author: achernya

githooks/hookutils.py

@@ -26,5 +26,5 @@ def run(args):
 def hookdir_file(name):
     return os.path.join(os.getenv('GIT_DIR'), 'hooks', name)
 
-if run(['git', 'config', 'hooks.verbose'])[0].lower == 'false':
+if run(['git', 'config', 'hooks.verbose'])[0].lower() == 'false':
     verbose = False