fix(node): support Node.js 8.x or newer

BREAKING CHANGE:
Support Node.js 8.x or newer, Transitive Dependency ip-regex@3.0.0
supports node ">=8".

Author: JamieMason

.travis.yml

@@ -2,10 +2,12 @@ language: node_js
 matrix:
   fast_finish: true
 node_js:
+  - 8.9.0
   - 10.13.0
 before_script:
-  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 >
-    ./codeclimate-test-reporter
+  - curl -L
+    https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64
+    > ./codeclimate-test-reporter
   - chmod +x ./codeclimate-test-reporter
   - ./codeclimate-test-reporter before-build
   - npm run build

package.json

@@ -42,6 +42,9 @@
     "tslint": "5.12.1",
     "typescript": "3.2.2"
   },
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "files": [
     "dist"
   ],