github-release 0.7.0

- github: extract into separate library.
- github: rename bodyType to mime.
- github: set per_page=100 as default.
- upload: streamline error handling a little bit.
- info: no tags/releases is no longer an error.
- download: refactor.
- release, edit: support description from stdin.
- upload: add -R/--replace switch.

version.go

@@ -1,3 +1,3 @@
 package main
 
-const VERSION = "0.6.4"
+const VERSION = "0.7.0"