Using an authentication header instead using the access_token query parameter

[Xiaoyang-Gu]

Signed-off-by: guxiaoyang_s20_307 guxiaoyang@bupt.edu.cn

Fix: https://github.com/casbin/casbin-dashboard/issues/135

Description :

Add access_token into http header when access the GitHub API to avoid the error [E] [account.go:97] json: cannot unmarshal object into Go value of type []controllers.userEmailFromGithub, fixed #135 .

Screenshot of changes :

Please ensure Checkmark the following :

• [x] - Tested Localy
• [x] - Checked in IE11 and Firefox
• [ ] - Checked in mobile
• [x] - Backend work
• [ ] - Frontend work
• [x] - Bug Fixes

[Xiaoyang-Gu]

@hsluoyz Please review!

[Xiaoyang-Gu]

@BetaCat0 @GopherJ Please review!

[Xiaoyang-Gu]

@BetaCat0 I have remove the hard-coding method temporarily.