use fixed version

Author: jojozhuang

.nvmrc

@@ -1 +1 @@
-14.16.1
+16.13.1

.travis.yml

@@ -1,11 +1,11 @@
 language: node_js
 node_js:
-  - "14.16.1"
+  - "16.13.1"
 sudo: true
 
 branches:
   only:
-  - master
+    - master
 
 deploy:
   # deploy app as api server
@@ -22,7 +22,7 @@ deploy:
     app: code-editor-react
 
 after_deploy:
-# change settings in Procfile for client
-# web: node src/server/index.js
-# web: node server.js
-- bash ./procfile_upd.sh
+  # change settings in Procfile for client
+  # web: node src/server/index.js
+  # web: node server.js
+  - bash ./procfile_upd.sh