Edit README.md
Fix link texts at README.md
Fix README.md
Add License Text, but occur bundler error
Fix git/contest/version
Change description at gemspec
Add Gem Version Badge at README.md
Add description of environment variables at README.md
Merge branch 'feature/sort-docs' into develop
Bump version into 0.0.2
Merge branch 'release/0.0.2' into develop