router.errorView is not effected when a router was created by calling router.NewGroupPath()

[cyannuk]

Easy fix

diff --git a/router.go b/router.go
index 9b5c5e3..e7550d4 100644
--- a/router.go
+++ b/router.go
@@ -38,6 +38,7 @@ func (r *Router) NewGroupPath(path string) *Router {
 	g.router = r.router.Group(path)
 	g.parent = r
 	g.beginPath = path
+	g.errorView = r.errorView
 
 	return g
 }

[savsgio]

I will have the pleasure to accept your PR if you want 😄

If not that's it, I will fix it.