Update dead link for debugging regex to regex101.com

Author: hrzlgnm

pkg/commands/hosting_service/definitions.go

@@ -1,7 +1,7 @@
 package hosting_service
 
 // if you want to make a custom regex for a given service feel free to test it out
-// at regoio.herokuapp.com
+// at https://regex101.com using the flavor Golang
 var defaultUrlRegexStrings = []string{
 	`^(?:https?|ssh)://[^/]+/(?P<owner>.*)/(?P<repo>.*?)(?:\.git)?$`,
 	`^.*?@.*:/*(?P<owner>.*)/(?P<repo>.*?)(?:\.git)?$`,