feat: require nginx 1.8.0+
feat: require nginx 1.8.0+

[ci skip]
progrium/dokku,jimjag/dokku,jimjag/dokku,elia/dokku,alexquick/dokku,claytonbrown/dokku,dokku/dokku,elia/dokku,alexquick/dokku,claytonbrown/dokku,alexquick/dokku,alexquick/dokku,jimjag/dokku,elia/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,fruitl00p/dokku,dokku/dokku,dokku/dokku,fruitl00p/dokku,elia/dokku,alexquick/dokku,alexquick/dokku,elia/dokku,jimjag/dokku,progrium/dokku,dokku/dokku,jimjag/dokku,jimjag/dokku,elia/dokku,claytonbrown/dokku,fruitl00p/dokku,dokku/dokku,jimjag/dokku,progrium/dokku,elia/dokku,alexquick/dokku,fruitl00p/dokku,claytonbrown/dokku,progrium/dokku,fruitl00p/dokku,fruitl00p/dokku,elia/dokku,progrium/dokku,jimjag/dokku,claytonbrown/dokku,alexquick/dokku,fruitl00p/dokku,claytonbrown/dokku,progrium/dokku,fruitl00p/dokku,dokku/dokku,dokku/dokku