feat: require Node.js 8.3

BREAKING CHANGE: remove support for Node.js < 8.3

Author: pvdlg

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 
 node_js:
+  - 12
   - 10
   - 8
-  - 6
 
 branches:
   only:

index.js

@@ -165,9 +165,12 @@ module.exports = (options = 'default', overrides = {}) => {
 
 	options = isString(options) ? hostConfig[options.toLowerCase()] : options;
 
-	const opts = Object.assign({}, hostConfig.default, options, overrides, {
-		actions: Object.assign({}, hostConfig.default.actions, options.actions, overrides.actions),
-	});
+	const opts = {
+		...hostConfig.default,
+		...options,
+		...overrides,
+		actions: {...hostConfig.default.actions, ...options.actions, ...overrides.actions},
+	};
 
 	normalize(opts);
 

package.json

@@ -21,7 +21,7 @@
     "xo": "^0.24.0"
   },
   "engines": {
-    "node": ">=6"
+    "node": ">=8.3"
   },
   "files": [
     "lib",