Dropped support of node 8, because of end of maintenance support.

.travis.yml

@@ -2,9 +2,9 @@ sudo: false
 language: node_js
 
 node_js:
-  - "8"
   - "10"
   - "12"
+  - "13"
   - "stable"
 
 cache:

package.json

@@ -12,7 +12,7 @@
     "js obfuscator"
   ],
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "main": "dist/index.js",
   "browser": "dist/index.browser.js",