Increment version to 0.8.1.20.

Author: baagaard-usgs

setup.py

@@ -15,7 +15,7 @@
 setup(
 
     name = 'pythia', 
-    version = '0.8.1.18',
+    version = '0.8.1.20',
 
     scripts = ['bin/idd.py', 'bin/ipad.py', 'bin/journald.py'],