chore: Fix CI (#555)

* ci: Setup to test webpack 4.x
* chore: Set peerDeps to 4.x & drop Node 4
* chore: Set engines to initial LTS release version
* chore: Add webpack@^4.5.0 as dev dependency again
* chore: Add package-lock.json
* chore: Remove alpha version tag from webpack 4 versions

Author: jhnns

.travis.yml

@@ -4,19 +4,15 @@ language: node_js
 branches:
   only:
     - master
-    - feature/webpack3
 jobs:
   fast_finish: true
   allow_failures:
     - env: WEBPACK_VERSION=canary
+    - node_js: 9
   include:
     - &test-latest
       stage: Webpack latest
-      nodejs: 6
-      env: WEBPACK_VERSION=latest JOB_PART=test
-      script: npm run travis:$JOB_PART
-    - <<: *test-latest
-      nodejs: 4.8
+      node_js: 6
       env: WEBPACK_VERSION=latest JOB_PART=test
       script: npm run travis:$JOB_PART
     - <<: *test-latest
@@ -29,10 +25,13 @@ jobs:
       script: npm run travis:$JOB_PART
       after_success: 'bash <(curl -s https://codecov.io/bash)'
     - stage: Webpack canary
-      before_script: npm i --no-save git://github.com/webpack/webpack.git#master
-      script: npm run travis:$JOB_PART
       node_js: 8
-      env: WEBPACK_VERSION=canary JOB_PART=test
+      env: WEBPACK_VERSION=4.0.0 JOB_PART=test
+      script: npm run travis:$JOB_PART
+    - stage: NodeJS Next
+      node_js: 9
+      env: WEBPACK_VERSION=latest JOB_PART=test
+      script: npm run travis:$JOB_PART
 before_install:
   - 'if [[ `npm -v` != 5* ]]; then npm i -g npm@^5.0.0; fi'
   - nvm --version

appveyor.yml

@@ -11,18 +11,18 @@ environment:
     - nodejs_version: '6'
       webpack_version: latest
       job_part: test
-    - nodejs_version: '4'
-      webpack_version: latest
+    - nodejs_version: '8'
+      webpack_version: 4.0.0
       job_part: test
 build: 'off'
 matrix:
   fast_finish: true
 install:
   - ps: Install-Product node $env:nodejs_version x64
-  - npm i -g npm@^5.0.0
+  - npm i -g npm@latest
   - npm install
 before_test:
-  - cmd: npm i --no-save webpack@%webpack_version%
+  - cmd: npm install webpack@%webpack_version%
 test_script:
   - node --version
   - npm --version