bump version to 0.20

Author: rdeits

setup.py

@@ -2,10 +2,10 @@
 from setuptools import setup, find_packages
 
 setup(name="meshcat",
-    version="0.0.19",
+    version="0.0.20",
     description="WebGL-based visualizer for 3D geometries and scenes",
     url="https://github.com/rdeits/meshcat-python",
-    download_url="https://github.com/rdeits/meshcat-python/archive/v0.0.19.tar.gz",
+    download_url="https://github.com/rdeits/meshcat-python/archive/v0.0.20.tar.gz",
     author="Robin Deits",
     author_email="[email protected]",
     license="MIT",