Update all the stuff.

* handlebars to v4.3.3
* chalk to v2.4.2
* CI configs

Minimum supported Node.js version is 8.x.

.jshintrc

@@ -3,6 +3,7 @@
   "curly": true,
   "eqeqeq": true,
   "eqnull": true,
+  "esnext": true,
   "immed": true,
   "latedef": true,
   "newcap": true,

.travis.yml

@@ -1,15 +1,15 @@
 sudo: false
+
 language: node_js
+
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4"
-  - "5"
-  - "iojs"
-before_install:
-  - if [ "$TRAVIS_NODE_VERSION" = "0.10" ]; then npm install -g npm@2; fi
+  - "6"
+  - "8"
+  - "10"
+
 matrix:
   fast_finish: true
+
 cache:
   directories:
     - node_modules

Gruntfile.js

@@ -1,6 +1,6 @@
 /*
  * grunt-contrib-handlebars
- * http://gruntjs.com/
+ * https://gruntjs.com/
  *
  * Copyright (c) 2016 Tim Branyen, contributors
  * Licensed under the MIT license.

appveyor.yml

@@ -1,30 +1,19 @@
-# http://www.appveyor.com/docs/appveyor-yml
-
 clone_depth: 10
 
 version: "{build}"
 
 # What combinations to test
 environment:
   matrix:
-    - nodejs_version: "0.10"
-      platform: x86
-    - nodejs_version: "0.12"
+    - nodejs_version: "6"
       platform: x86
-    - nodejs_version: "4"
-      platform: x64
-    - nodejs_version: "4"
+    - nodejs_version: "8"
       platform: x86
-    - nodejs_version: "5"
+    - nodejs_version: "10"
       platform: x86
 
 install:
   - ps: Install-Product node $env:nodejs_version $env:platform
-  - ps: >-
-      if ($env:nodejs_version -eq "0.10") {
-        npm -g install npm@2
-        $env:PATH="$env:APPDATA\npm;$env:PATH"
-      }
   - npm install
 
 test_script: