feat: use npm ci for tests (webpack#367) (webpack#368)

* feat: use npm ci for tests

* fix(npm version): updated npm version to support npm ci

* fix(npm version): removed npm from package.json and package-lock.json

.appveyor.yml

@@ -12,7 +12,8 @@ build: off
 
 install:
   - ps: Install-Product node $env:nodejs_version $env:platform
-  - npm install
+  - npm i -g npm
+  - npm ci
   - npm install --global codecov
   - npm install eslint-plugin-node@latest --save-dev
 

.travis.yml

@@ -22,8 +22,11 @@ sudo: false
 notifications:
   email: false
 
+before_install:
+  - npm i -g npm
+
 install:
-  - npm install
+  - npm ci
   - npm install --global codecov
   - npm install --global eslint
 
@@ -33,4 +36,4 @@ before_script:
 
 script:
   - npm run travis:$JOB_PART
-  - commitlint-travis
+  - commitlint-travis