fix(last-release): normalized registry url

src/index.js

@@ -65,7 +65,7 @@ npmconf.load({}, (err, conf) => {
           token: env.NPM_TOKEN
         },
         loglevel: log.level,
-        registry
+        registry: registry + (registry[registry.length - 1] !== '/' ? '/' : '')
       },
       plugins,
       (err, release) => {

src/lib/last-release.js

@@ -5,7 +5,7 @@ module.exports = function (pkg, npmConfig, cb) {
   npmlog.level = npmConfig.loglevel || 'error'
   const client = new RegClient({log: npmlog})
 
-  client.get(`${npmConfig.registry}/${pkg.name}`, {
+  client.get(`${npmConfig.registry}${pkg.name}`, {
     auth: npmConfig.auth
   }, (err, data) => {
     if (err && err.statusCode === 404) return cb(null, {})