Merge pull request #9 from yoshinorin/release/v2.0.0

chore: drop Node.js 8, 10 & update version from 1.0.0 to 2.0.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hexo-renderer-pug",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "description": "Pug renderer plugin for Hexo",
   "main": "index.js",
   "scripts": {
@@ -38,6 +38,6 @@
     "nyc": "^15.1.0"
   },
   "engines": {
-    "node": ">=8.6.0"
+    "node": ">=12.4.0"
   }
 }