Document supported Node.js version (#414)

* Update ci_validation.yml

* add node supported version in readme

* package.json node engine

Author: nikithauc

.github/workflows/ci_validation.yml

@@ -12,11 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x, 14.x, 15.x]
-        # Adding version 8.x considering SharePoint Framework depends on JS Graph library
-        # https://docs.microsoft.com/en-us/sharepoint/dev/spfx/compatibility
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
+        node-version: [10.x, 12.x, 14.x, 15.x]
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}

README.md

@@ -8,6 +8,9 @@ The Microsoft Graph JavaScript client library is a lightweight wrapper around th
 
 [![TypeScript demo](https://raw.githubusercontent.com/microsoftgraph/msgraph-sdk-javascript/master/types-demo.PNG)](https://github.com/microsoftgraph/msgraph-typescript-typings)
 
+## Node version requirement
+Node.js 10 LTS or higher.
+
 ## Installation
 
 ### Via npm

package.json

@@ -128,5 +128,8 @@
 		"stream-browserify": {
 			"optional": true
 		}
+	},
+	"engines": {
+		"node": ">=10.0.0"
 	}
 }