Drop node 8 (Level/community#98)

Author: vweevers

Diff for: .travis.yml

@@ -7,9 +7,9 @@ os:
   - linux
 
 node_js:
-  - 8
   - 10
   - 12
+  - 14
 
 after_success: npm run coverage
 

Diff for: appveyor.yml

@@ -4,9 +4,9 @@ skip_tags: true
 
 environment:
   matrix:
-    - nodejs_version: "8"
     - nodejs_version: "10"
     - nodejs_version: "12"
+    - nodejs_version: "14"
 
 platform:
   - x64

Diff for: package.json

@@ -54,6 +54,6 @@
     "json"
   ],
   "engines": {
-    "node": ">=8.6.0"
+    "node": ">=10.12.0"
   }
 }