Prepare release v3.1.0 (#940)

* Prepare changelog for v3.1.0

* Bump package

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v3.1.0
+- [Use @actions/core `saveState` and `getState`](https://github.com/actions/checkout/pull/939)
+- [Add `github-server-url` input](https://github.com/actions/checkout/pull/922)
+
 ## v3.0.2
 - [Add input `set-safe-directory`](https://github.com/actions/checkout/pull/770)
 

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "checkout",
-  "version": "2.0.2",
+  "version": "3.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "checkout",
-  "version": "2.0.2",
+  "version": "3.1.0",
   "description": "checkout action",
   "main": "lib/main.js",
   "scripts": {