build: Add IntelliJ 2021.3 (#63)

Fixes #62

Signed-off-by: Jeff MAURY <[email protected]>

Author: jeffmaury

.github/workflows/IJ.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        IJ: [IC-2020.1, IC-2020.2, IC-2020.3, IC-2021.1, IC-2021.2]
+        IJ: [IC-2020.1, IC-2020.2, IC-2020.3, IC-2021.1, IC-2021.2, IC-2021.3]
 
     steps:
     - uses: actions/checkout@v2
@@ -40,7 +40,7 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Build with Gradle
-        run: ./gradlew runPluginVerifier -PideaVersion=IC-2021.2
+        run: ./gradlew runPluginVerifier -PideaVersion=IC-2021.3
       - name: Upload report
         uses: actions/upload-artifact@v2
         if: always()