Update supported platforms

- Drop support for Node.js v4
- Add support for Node.js v10
- Drop support for IE < 11

.babelrc

@@ -7,7 +7,7 @@
             {
                 "modules": false,
                 "targets": {
-                    "ie": 9
+                    "ie": 11
                 }
             }
         ]

.eslintrc.js

@@ -2,7 +2,7 @@
 
 module.exports = {
 
-    "extends": "futagozaryuu/node-v4",
+    "extends": "futagozaryuu/node-v6",
     "root": true,
     "rules": {
 

.travis.yml

@@ -3,9 +3,9 @@ sudo: false
 language: node_js
 
 node_js:
-  - "4"
   - "6"
   - "8"
+  - "10"
 
 after_success:
   - yarn coverage

docs/notes/compatibility.md

@@ -2,9 +2,9 @@
 
 Both the parser generator and generated parsers should run well in the following environments:
 
-* Node.js 4+
+* Node.js v6+
-* Internet Explorer 9+
+* Internet Explorer 11
-* Edge
+* Microsoft Edge
 * Firefox
 * Chrome
 * Safari

package.json

@@ -65,6 +65,6 @@
         "vinyl-source-stream": "2.0.0"
     },
     "engines": {
-        "node": ">=4"
+        "node": ">= 6"
     }
 }