Add the option acceptedMethods

Add the option `acceptedMethods` to allow for requests with method other than "GET" to be processed

Author: ferdinando-ferreira

lib/middleware.js

@@ -24,7 +24,8 @@ module.exports = function wrapper(context) {
       }));
     }
 
-    if (req.method !== 'GET') {
+    const acceptedMethods = context.options.acceptedMethods || ['GET'];
+    if (acceptedMethods.indexOf(req.method) === -1) {
       return goNext();
     }