Update priority for config path

Previously, the environment variable would take priority over the
command line argument. This is now reversed.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

omnibot/__main__.py

@@ -9,7 +9,7 @@ from .config import ServerConfig
 from .bot import Bot
 
 parser = argparse.ArgumentParser(description="Run an IRC bot")
-parser.add_argument("-c", "--config", type=str, default="config.toml")
+parser.add_argument("-c", "--config", type=str, default=None)
 parser.add_argument(
     "--loglevel",
     type=str,
@@ -18,7 +18,7 @@ parser.add_argument(
 )
 args = parser.parse_args()
 
-config_path = Path(os.environ.get("OMNIBOT_CONFIG", args.config))
+config_path = Path(args.config or os.environ.get("OMNIBOT_CONFIG", "config.toml"))
 config = ServerConfig()
 
 try: