feat: add embedmd (#3)

.travis.yml

@@ -9,8 +9,10 @@ go:
 
 install:
   - echo "ignore go get"
+  - go get github.com/campoy/embedmd
 
 script:
+  - embedmd -d *.md
   - go test -v -covermode=atomic -coverprofile=coverage.out
 
 after_success:

README.md

@@ -27,6 +27,7 @@ import "github.com/gin-contrib/static"
 
 See the [example](example)
 
+[embedmd]:# (example/simple/example.go go)
 ```go
 package main