Increment version to 0.0.21 (#89)

Author: will-rice

setup.py

@@ -110,7 +110,7 @@ def run(self) -> None:
 
 setup(
     name="spokestack",
-    version="0.0.20",
+    version="0.0.21",
     author="Spokestack",
     author_email="[email protected]",
     description="Spokestack Library for Python",