no retry if client error

lib/index.js

@@ -87,10 +87,10 @@ export default class Now extends EventEmitter {
       });
       if (this._debug) console.timeEnd('> [debug] /create');
 
-      // no retry on 403
-      if (403 === res.status) {
+      // no retry on 4xx
+      if (400 <= res.status && 500 > res.status) {
         if (this._debug) {
-          console.log('> [debug] bailing on creating due to 403');
+          console.log('> [debug] bailing on creating due to %s', res.status);
         }
         return bail(responseError(res));
       }
@@ -140,9 +140,9 @@ export default class Now extends EventEmitter {
         });
         if (this._debug) console.timeEnd(`> [debug] /sync ${name}`);
 
-        // no retry on 403
-        if (403 === res.status) {
-          if (this._debug) console.log('> [debug] bailing on creating due to 403');
+        // no retry on 4xx
+        if (400 <= res.status || 500 > res.status) {
+          if (this._debug) console.log('> [debug] bailing on creating due to %s', res.status);
           return bail(responseError(res));
         }