fix golint.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

gorush.go

@@ -19,6 +19,7 @@ func checkInput(token, message string) {
 	}
 }
 
+// Version control for gorush.
 var Version = "No Version Provided"
 
 var usageStr = `

gorush/version.go

@@ -8,10 +8,12 @@ import (
 
 var version string
 
+// SetVersion for setup version string.
 func SetVersion(ver string) {
 	version = ver
 }
 
+// GetVersion for get current version.
 func GetVersion() string {
 	return version
 }