feat: Enable nodemon to monitor file removal (#2182)

Author: markulaw

lib/monitor/watch.js

@@ -87,6 +87,7 @@ function watch() {
     var total = 0;
 
     watcher.on('change', filterAndRestart);
+    watcher.on('unlink', filterAndRestart);
     watcher.on('add', function (file) {
       if (watcher.ready) {
         return filterAndRestart(file);