fix: langauge around "watching" (#1591)

ref: #1583

It was unclear whether it was listing files being watched when in fact
it was the list of directories (plus, make it cleaner)

lib/nodemon.js

@@ -180,8 +180,16 @@ function nodemon(settings) {
     }).filter(Boolean).join(' ');
     if (ignoring) utils.log.detail('ignoring: ' + ignoring);
 
-    utils.log.info('watching: ' + config.options.monitor.map(function (rule) {
-      return rule.slice(0, 1) !== '!' ? rule : false;
+    utils.log.info('watching dir(s): ' + config.options.monitor.map(function (rule) {
+      if (rule.slice(0, 1) !== '!') {
+        try {
+          rule = path.relative(process.cwd(), rule);
+        } catch (e) {}
+
+        return rule;
+      }
+
+      return false;
     }).filter(Boolean).join(' '));
 
     utils.log.detail('watching extensions: ' + (config.options.execOptions.ext || '(all)'));