chore: Set engines to initial LTS release version

Author: joshwiens

.travis.yml

@@ -8,16 +8,13 @@ jobs:
   fast_finish: true
   allow_failures:
     - env: WEBPACK_VERSION=canary
+    - node_js: 9
   include:
     - &test-latest
       stage: Webpack latest
       node_js: 6
       env: WEBPACK_VERSION=latest JOB_PART=test
       script: npm run travis:$JOB_PART
-    - <<: *test-latest
-      node_js: 4.8
-      env: WEBPACK_VERSION=latest JOB_PART=test
-      script: npm run travis:$JOB_PART
     - <<: *test-latest
       node_js: 8
       env: WEBPACK_VERSION=latest JOB_PART=lint
@@ -31,6 +28,10 @@ jobs:
       node_js: 8
       env: WEBPACK_VERSION=4.0.0-alpha.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

package.json

@@ -45,7 +45,7 @@
     "webpack": "^3.0.0 || ^4.0.0-alpha.0 || ^4.0.0"
   },
   "engines": {
-    "node": ">= 6 || >= 8"
+    "node": ">= 6.9.0 || >= 8.9.0"
   },
   "repository": {
     "type": "git",