Reduce boilerplate in a few more service testers [cdnjs continuousphp node shippable wercker gem] (#1957)

Follow up to #1934.

services/continuousphp/continuousphp.service.js

@@ -4,6 +4,10 @@ const LegacyService = require('../legacy-service')
 const { makeBadgeData: getBadgeData } = require('../../lib/badge-data')
 
 module.exports = class ContinuousPhp extends LegacyService {
+  static get url() {
+    return { base: 'continuousphp' }
+  }
+
   static registerLegacyRouteHandler({ camp, cache }) {
     camp.route(
       /^\/continuousphp\/([^/]+)\/([^/]+\/[^/]+)(?:\/(.+))?\.(svg|png|gif|jpg|json)$/,