update caddy from v1 to v2 (#7)

* update casbin from v2.0.1 to v2.8.6

Signed-off-by: 00LT00 <[email protected]>

* update caddy from v1 to v2

Signed-off-by: 00LT00 <[email protected]>

* update caddy from v1 to v2

Signed-off-by: 00LT00 <[email protected]>

* update readme

Signed-off-by: 00LT00 <[email protected]>

* Update go.mod

update module name

Signed-off-by: 00LT00 <[email protected]>

* fix module name

Signed-off-by: 00LT00 <[email protected]>

Update Caddy's import path, fix: #4

Update .travis.yml (#2)

* Update .travis.yml

I believe this may fix current build errors.

Remove casbin.conf in README.