Fix script up to search branches

Author: elliottmurray

script/commit_message.py

@@ -14,7 +14,11 @@
 
 def main():
 
-    cmd = "git log --pretty=format:'%s' master..HEAD"
+    cmd_tag = "git describe --abbrev=0"
+    tag = subprocess.check_output(cmd_tag,
+                                  shell=True).decode("utf-8").split('\n')[0]
+
+    cmd = "git log --pretty=format:'%s' {}..master".format(tag)
     commits = subprocess.check_output(cmd, shell=True)
     commits = commits.decode("utf-8").split('\n')
     for commit in commits: