drop support for node <6 (estools#419)

sanex3339 · sanex3339 · commit 05ff3acf3a9e · 2020-08-15T00:24:22.000+03:00
Co-authored-by: sanex3339 &lt;yarabotayuvyandex3339&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - "4"
   - "6"
   - "8"
+  - "10"
diff --git a/package.json b/package.json
@@ -16,7 +16,7 @@
     ],
     "version": "1.14.3",
     "engines": {
-        "node": ">=4.0"
+        "node": ">=6.0"
     },
     "maintainers": [
         {
