Added WebUrl to Job struct that is provided by the Gitlab API json, b… (#491)

* Added WebUrl to Job struct that is provided by the Gitlab API json, but not included in the client Job struct.

* modifed field name to conform to lint preferences

jobs.go

@@ -59,6 +59,7 @@ type Job struct {
 	Status    string     `json:"status"`
 	Tag       bool       `json:"tag"`
 	User      *User      `json:"user"`
+	WebURL    string     `json:"web_url"`
 }
 
 // ListJobsOptions are options for two list apis