feat(Node.js): Drop support for Node.js 8

Connects pelias/pelias#837

Author: orangejulius

Diff for: .travis.yml

@@ -3,7 +3,6 @@ language: node_js
 notifications:
   email: false
 node_js:
-  - 8
   - 10
 matrix:
   fast_finish: true

Diff for: package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0-development",
   "description": "Database client for Pelias import pipelines",
   "engines": {
-    "node": ">=8.0.0"
+    "node": ">=10.0.0"
   },
   "main": "index.js",
   "scripts": {