bugfix: git url pattern 
bugfix: git url pattern 

github git urls format is "git@...". `dokku plugin:install` command will fail due to format not being matched.
dokku/dokku,codeconfab/dokku,johnfraney/dokku,dokku/dokku,Evlos/dokku,claytonbrown/dokku,econya/dokku,amaltson/dokku,dokku/dokku,amaltson/dokku,alexquick/dokku,progrium/dokku,elia/dokku,johnfraney/dokku,elia/dokku,codeconfab/dokku,alexquick/dokku,codeconfab/dokku,elia/dokku,alexquick/dokku,johnfraney/dokku,jimjag/dokku,expa/dokku,amaltson/dokku,elia/dokku,amaltson/dokku,claytonbrown/dokku,alexquick/dokku,johnfraney/dokku,progrium/dokku,Evlos/dokku,progrium/dokku,jimjag/dokku,elia/dokku,sseemayer/dokku,progrium/dokku,claytonbrown/dokku,econya/dokku,econya/dokku,claytonbrown/dokku,claytonbrown/dokku,sseemayer/dokku,econya/dokku,elia/dokku,codeconfab/dokku,amaltson/dokku,dokku/dokku,sseemayer/dokku,claytonbrown/dokku,expa/dokku,progrium/dokku,Evlos/dokku,Evlos/dokku,fruitl00p/dokku,expa/dokku,johnfraney/dokku,amaltson/dokku,econya/dokku,alexquick/dokku,jimjag/dokku,amaltson/dokku,fruitl00p/dokku,codeconfab/dokku,sseemayer/dokku,johnfraney/dokku,jimjag/dokku,dokku/dokku,Evlos/dokku,progrium/dokku,alexquick/dokku,fruitl00p/dokku,sseemayer/dokku,progrium/dokku,jimjag/dokku,alexquick/dokku,Evlos/dokku,econya/dokku,elia/dokku,claytonbrown/dokku,expa/dokku,codeconfab/dokku,fruitl00p/dokku,econya/dokku,johnfraney/dokku,johnfraney/dokku,alexquick/dokku,dokku/dokku,dokku/dokku,fruitl00p/dokku,sseemayer/dokku,fruitl00p/dokku,expa/dokku,fruitl00p/dokku,sseemayer/dokku,codeconfab/dokku,expa/dokku,jimjag/dokku,progrium/dokku,codeconfab/dokku,jimjag/dokku,Evlos/dokku,dokku/dokku,fruitl00p/dokku,jimjag/dokku,sseemayer/dokku,expa/dokku,expa/dokku,Evlos/dokku,amaltson/dokku,claytonbrown/dokku,econya/dokku,elia/dokku