breaking: drop support for Node.js < v10

- handlebars is changing to a policy of only supporting current and active versions of Node.js

Author: ErisDS

README.markdown

@@ -79,7 +79,7 @@ Supported Environments
 
 Handlebars has been designed to work in any ECMAScript 3 environment. This includes
 
-- Node.js
+- Node.js 10+
 - Chrome
 - Firefox
 - Safari 5+
@@ -110,7 +110,7 @@ Upgrading
 
 See [release-notes.md](https://github.com/wycats/handlebars.js/blob/master/release-notes.md) for upgrade notes.
 
-If you are using Handlebars in production, please regularly look for issues labeled 
+If you are using Handlebars in production, please regularly look for issues labeled
 [possibly breaking](https://github.com/wycats/handlebars.js/issues?q=is%3Aopen+is%3Aissue+label%3A%22possibly+breaking%22).
 If this label is applied to an issue, it means that the requested change is probably not a breaking change,
 but since Handlebars is widely in use by a lot of people, chances are always there that it breaks somebodies build.

integration-testing/multi-nodejs-test/test.sh

@@ -17,7 +17,7 @@ cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
 unset npm_config_prefix
 
 echo "Handlebars should be able to run in various versions of NodeJS"
-for i in  0.10 0.12 4 5 6 7 8 9 10 11 ; do
+for i in  10 11 12 13 ; do
     rm target node_modules package-lock.json -rf
     mkdir target
     nvm install "$i"

package.json

@@ -18,7 +18,7 @@
   "license": "MIT",
   "readmeFilename": "README.markdown",
   "engines": {
-    "node": ">=0.4.7"
+    "node": ">=10"
   },
   "dependencies": {
     "neo-async": "^2.6.0",