feat(url): call afterEach hooks after url is ensured (#2292)

Closes #2079

This helps integrating with external scripts and makes more sense as the
navigation is finished.  However, onComplete callback passed to
`router.push` is now called before `afterEach` hooks. This shouldn't be
a problem as there's no guarantee provided anywhere in the docs about
this

src/history/base.js

@@ -81,9 +81,13 @@ export class History {
     this.confirmTransition(
       route,
       () => {
+        const prev = this.current
         this.updateRoute(route)
         onComplete && onComplete(route)
         this.ensureURL()
+        this.router.afterHooks.forEach(hook => {
+          hook && hook(route, prev)
+        })
 
         // fire ready cbs once
         if (!this.ready) {
@@ -214,12 +218,8 @@ export class History {
   }
 
   updateRoute (route: Route) {
-    const prev = this.current
     this.current = route
     this.cb && this.cb(route)
-    this.router.afterHooks.forEach(hook => {
-      hook && hook(route, prev)
-    })
   }
 
   setupListeners () {