chore: drop node 6 and 8 support (#480)

diff --git a/.travis.yml b/.travis.yml
index a219381..b8e3a23 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,8 +8,6 @@
     - $HOME/.npm
 
 node_js:
-  - 6
-  - 8
   - 10
   - 12
 
diff --git a/appveyor.yml b/appveyor.yml
index bf13e43..bf6b0c1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,8 +7,6 @@
 
 environment:
   matrix:
-    - nodejs_version: 6
-    - nodejs_version: 8
     - nodejs_version: 10
     - nodejs_version: 12
 
diff --git a/package.json b/package.json
index 4cf6a8b..21a9480 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "description": "Cordova command line interface tool",
   "main": "cordova",
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=10.0.0"
   },
   "bin": {
     "cordova": "./bin/cordova"