chore(monorepo): fix appveyor build

Author: sendilkumarn

.appveyor.yml

@@ -16,6 +16,7 @@ install:
   - npm ci
   - npm install --global codecov
   - npm install eslint-plugin-node@latest --save-dev
+  - npm install eslint-plugin-prettier@latest --save-dev
 
 test_script:
   - node --version