Deno plugins (#42)

Switch from BoaJS to Deno core

plugins/filter-xpath/src/index.js

@@ -1,7 +1,7 @@
 import xpath from 'xpath';
 import { DOMParser } from '@xmldom/xmldom';
 
-export function pluginHookResponseFilter(filter, text) {
+export function pluginHookResponseFilter(ctx, filter, text) {
   const doc = new DOMParser().parseFromString(text, 'text/xml');
   const filtered = `${xpath.select(filter, doc)}`;
   return { filtered };