Update version (#237)

Bump the version number to 0.8.1 for pypi

Author: pharmapsychotic

setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name='stability-sdk',
-    version='0.8.0',
+    version='0.8.1',
     author='Stability AI',
     author_email='[email protected]',
     maintainer='Stability AI',