Update release procedure

RELEASE.md

@@ -7,6 +7,13 @@ Release instructions
 * Tag a release
 * Push master & tag to GitHub
 
+Github release
+--------------
+
+* Create a release for new tag, paste changelog since last tag in description
+* Download assets generated by github (.zip and .tar.gz) and upload them to the relase
+* Also upload the generated .deb file
+
 Publishing to PyPI
 ------------------