Merge pull request #115 from kazuki43zoo/support-jdk18ga-19ea

Support JDK 18-GA and 19-EA on CI

Author: kazuki43zoo

.github/workflows/ci.yaml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        java: [8, 11, 17, 18-ea]
+        java: [8, 11, 17, 18, 19-ea]
         distribution: ['zulu']
       fail-fast: false
       max-parallel: 4