chore: change supported node versions

This adds testing for node v11 - v14. This removes testing for node v6
and v7 because codecov breaks on these versions. This omits node v15
because appveyor doesn't seem to support this version. The nodejs org
currently supports [10, 12, 14, 15].

This adds a small logging statement to the check-node-support script.

Test: npm run check-node-support

.travis.yml

@@ -1,11 +1,13 @@
 language: node_js
 sudo: false
 node_js:
-  - 6
-  - 7
   - 8
   - 9
   - 10
+  - 11
+  - 12
+  - 13
+  - 14
 
 os:
   - linux

README.md

@@ -10,7 +10,7 @@
 commands, providing an easy solution for simple Unix-like, cross-platform
 commands in npm package scripts.
 
-`shx` is proudly tested on every node release since <!-- start minVersion -->`v6`<!-- stop minVersion -->!
+`shx` is proudly tested on every node release since <!-- start minVersion -->`v8`<!-- stop minVersion -->!
 
 ## Difference Between ShellJS and shx
 

appveyor.yml

@@ -1,10 +1,12 @@
 environment:
   matrix:
+    - nodejs_version: '14'
+    - nodejs_version: '13'
+    - nodejs_version: '12'
+    - nodejs_version: '11'
     - nodejs_version: '10'
     - nodejs_version: '9'
     - nodejs_version: '8'
-    - nodejs_version: '7'
-    - nodejs_version: '6'
 
 version: '{build}'
 

package.json

@@ -75,6 +75,6 @@
     "shelljs": "^0.8.4"
   },
   "engines": {
-    "node": ">=6"
+    "node": ">=8"
   }
 }

scripts/check-node-support.js

@@ -8,8 +8,8 @@ var yaml = require('js-yaml');
 var shell = require('shelljs');
 
 // This is the authoritative list of supported node versions.
-var MIN_NODE_VERSION = 6;
-var MAX_NODE_VERSION = 10;
+var MIN_NODE_VERSION = 8;
+var MAX_NODE_VERSION = 14;
 
 function checkReadme(minNodeVersion) {
   var start = '<!-- start minVersion -->';
@@ -78,6 +78,8 @@ try {
   var appveyorFileName = path.join(__dirname, '..', 'appveyor.yml');
   var appveyorYaml = yaml.safeLoad(shell.cat(appveyorFileName));
   checkAppveyor(MIN_NODE_VERSION, MAX_NODE_VERSION, appveyorYaml);
+  console.log('All files look good (this project supports v'
+      + MIN_NODE_VERSION + '-v' + MAX_NODE_VERSION + ')!');
 } catch (e) {
   console.error('Please check the files which declare our Node version');
   console.error('support, as something is out-of-sync. This script failed');