add guard and update generator version (#757)

Author: MikeVitik

.github/workflows/generator-guard.yml

@@ -0,0 +1,29 @@
+name: Guard - Up version generator if sourcies files changed 
+
+on:
+  push:
+    branches:
+    - master
+    - '[12][0-9].[12]'
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  guard:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+
+    steps:
+    - name: Get sources
+      uses: actions/checkout@v2
+
+    - name: Get changed files
+      id: changed
+      uses: tj-actions/[email protected]
+
+    - name: Check changes
+      if: ${{ contains(steps.changed.outputs.all_changed_files, 'devextreme-react-generator/src/') && !contains(steps.changed.outputs.all_changed_files, 'devextreme-react-generator/package.json') }}
+      run: |
+        echo "Please update version in packages/devextreme-react-generator/package.json"
+        exit 1

packages/devextreme-react-generator/package.json

@@ -1,7 +1,7 @@
 {
   "author": "Developer Express Inc.",
   "name": "devextreme-react-generator",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "DevExtreme React UI and Visualization Components",
   "repository": {
     "type": "git",