added min nodejs version info & updated .travis.yml

.travis.yml

@@ -1,10 +1,10 @@
 language: node_js
 
 node_js:
-  - 8
   - 10
   - 11
   - 12
+  - 13
 
 env:
   - INSTALL=yarn
@@ -13,9 +13,6 @@ env:
 
 matrix:
   fast_finish: true
-  exclude:
-    - node_js: 8
-      env: INSTALL=yarn
 
 install:
   - if [ "yarn" == $INSTALL ]; then yarn install; fi

README.md

@@ -31,6 +31,8 @@ Download from [Github releases](https://github.com/ColorlibHQ/AdminLTE/releases)
 
 #### Using The Command Line:
 
+_Note: To install it via NPM/Yarn, you need at least Node.js 10 or higher._
+
 __Via NPM__
 ```bash
 npm install admin-lte@^3.0 --save