chore: replace use of deprecated fastify.request.context (#348)

index.js

@@ -167,7 +167,7 @@ function fastifyView (fastify, opts, next) {
   }
 
   function getRequestedPath (fastify) {
-    return (fastify && fastify.request) ? fastify.request.context.config.url : null
+    return (fastify && fastify.request) ? fastify.request.routerPath : null
   }
   // Gets template as string (or precompiled for Handlebars)
   // from LRU cache or filesystem.