Remove extra new lines at the ends of Zulip authoried files.

Fixes #1627.

[tweaked by tabbott to avoid patching third-party modules, for now]

bots/log2zulip

@@ -110,4 +110,3 @@ if __name__ == "__main__":
             os.remove(lock_path)
         except OSError as IOError:
             pass
-

bots/sync-public-streams

@@ -64,4 +64,3 @@ if __name__ == "__main__":
         f.close()
 
         subprocess.call(["mv", "/home/zulip/public_streams.tmp", "/home/zulip/public_streams"])
-

contrib_bots/lib/readme.md

@@ -106,4 +106,3 @@ If you are not interested in running your bots on the
 server, then you can still use the full Zulip API.  The
 hope, though, is that this architecture will make
 writing simple bots a quick/easy process.
-