Merge pull request #1132 from bitcoinjs/lts

Remove Node 6, update to Node LTS

.travis.yml

@@ -1,16 +1,14 @@
 sudo: false
 language: node_js
 node_js:
-  - "6"
-  - "7"
   - "8"
   - "9"
   - "10"
 matrix:
   include:
-    - node_js: "6"
+    - node_js: "8"
       env: TEST_SUITE=standard
-    - node_js: "6"
+    - node_js: "8"
       env: TEST_SUITE=coverage
 env:
   - TEST_SUITE=unit

package.json

@@ -4,7 +4,7 @@
   "description": "Client-side Bitcoin JavaScript library",
   "main": "./src/index.js",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=8.0.0"
   },
   "keywords": [
     "bitcoinjs",