Updates

• Added support to import repo/project from gogs, gitea, and bitbucket
• Image upload support in pull request description and comments
• Make File SHA optional in File Commit API
• View files without extension as text file in UI
• Fix security vulnerability : github.com/dgrijalva/jwt-go
• Added updated filter in list PR API
• Fix file rename only case in File Viewed feature
• Update PR.editedAt time when head branch is updated

Full Changelog: v3.0.0-beta.3...v3.0.0-beta.4