Use Go1.11 module (#5743)

* Migrate to go modules

* make vendor

* Update mvdan.cc/xurls

* make vendor

* Update code.gitea.io/git

* make fmt-check

* Update github.com/go-sql-driver/mysql

* make vendor

vendor/github.com/go-macaron/binding/.travis.yml

@@ -0,0 +1,15 @@
+sudo: false
+language: go
+
+go:
+  - 1.3
+  - 1.4
+  - 1.5
+  - 1.6
+  - tip
+
+script: go test -v -cover -race
+
+notifications:
+  email:
+    - u@gogs.io