v1.0.4

Changelog

• 368453d add keybind list to README
• 8b4477e add read command
• 45e14f9 add self update binary command
• a75d6d5 allow create new file to existing gist via --gist-id flag
• 0d3dd2b better demo
• c0674b9 make getContent non blocking
• 80b66af preload gists on every exec as global
• 5391d3f read gist content from remote instead of local store
• 851e911 use global github client and some refactoring here and there