remove support for node v6/7

Author: ctalkington

.travis.yml

@@ -4,6 +4,5 @@ node_js:
   - 12
   - 10
   - 8
-  - 6
 matrix:
   fast_finish: true

CHANGELOG.md

@@ -1,5 +1,11 @@
 ## Changelog
 
+**3.1.1** - <small>_April 14, 2020_</small> — [Diff](https://github.com/archiverjs/node-archiver/compare/3.1.1...4.0.0)
+
+- breaking: slowly catch up with node LTS, remove support for versions under 8.
+- update multiple deps.
+- fix for a hang with _statQueue (#388)
+
 **3.1.1** - <small>_August 2, 2019_</small> — [Diff](https://github.com/archiverjs/node-archiver/compare/3.1.0...3.1.1)
 
 - update zip-stream to v2.1.2

appveyor.yml

@@ -3,7 +3,6 @@ environment:
     - nodejs_version: '12'
     - nodejs_version: '10'
     - nodejs_version: '8'
-    - nodejs_version: '6'
 install:
   - ps: Install-Product node $env:nodejs_version
   - set CI=true

package.json

@@ -21,7 +21,7 @@
     "lib"
   ],
   "engines": {
-    "node": ">= 6"
+    "node": ">= 8"
   },
   "scripts": {
     "test": "mocha --reporter dot",