Add __main__.py for creating OAuth token

.gitignore

@@ -10,4 +10,6 @@ dist
 .idea/
 .tox/
 .DS_Store
-example
+example
+venv
+.env

README.rst

@@ -78,7 +78,7 @@ Run
 
 ::
 
-    python ./trello/util.py
+    python -m trello oauth
 
 Required Python modules
 =======================

trello/__main__.py

@@ -0,0 +1,17 @@
+import sys
+
+from trello.util import create_oauth_token
+
+
+def main():
+    try:
+        command = sys.argv[1]
+    except IndexError:
+        return
+
+    if command == "oauth":
+        create_oauth_token()
+
+
+if __name__ == "__main__":
+    sys.exit(main())

trello/util.py

@@ -87,7 +87,4 @@ def create_oauth_token(expiration=None, scope=None, key=None, secret=None, name=
 
     return access_token
 
-if __name__ == '__main__':
-    create_oauth_token()
-
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