Breaking: drop node 6 and 8 (Level/community#98)

Author: vweevers

.travis.yml

@@ -4,11 +4,11 @@ language: node_js
 matrix:
   fast_finish: true
   include:
-  - node_js: 6
+  - node_js: 10
     env: CMD=test
-  - node_js: 8
+  - node_js: 12
     env: CMD=test
-  - node_js: 10
+  - node_js: 14
     env: CMD=test
   - node_js: stable
     env: CMD=test-browsers

package.json

@@ -65,6 +65,6 @@
     "memory"
   ],
   "engines": {
-    "node": ">=6"
+    "node": ">=10"
   }
 }