Add missing isPrerelease to action.yml.

Author: freezy

README.md

@@ -43,7 +43,7 @@ Example yml:
           fetch-depth: 0
       - name: Fetch next version
         id: nextVersion
-        uses: freezy/VisualPinball.NextVersionAction@v0.1.3
+        uses: freezy/VisualPinball.NextVersionAction@v0.1.4
       - name: Log version and next version
         run: |
           echo "${{ steps.nextVersion.outputs.version }}"

action.yml

@@ -14,6 +14,8 @@ outputs:
     description: 'Computed next version'
   nextTag:
     description: 'Computed next version with prefix'
+  isPrerelease:
+    description: 'If true, the version is a pre-release'
 runs:
   using: 'node12'
   main: 'dist/index.js'

package.json

@@ -1,6 +1,6 @@
 {
   "name": "visualpinball-next-version-action",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "Action used for determining the next version of VisualPinball.* projects.",
   "main": "lib/main.js",
   "scripts": {