Add up to version 18

Author: henri-tremblay

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     timeout-minutes: 2
     strategy:
       matrix:
-        java: [ '8', '11', '17' ]
+        java: [ '8', '11', '17', '18' ]
     steps:
     - uses: actions/checkout@v3
     - name: Set up JDK

SupportedJVMs.md

@@ -1,7 +1,7 @@
 # List of currently supported JVMs
 
-* Sun/Oracle Hotspot VM, versions 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 9 to 16
-* OpenJDK 6, 7, 8, 9 to 16
+* Sun/Oracle Hotspot VM, versions 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 9 to 18
+* OpenJDK 6, 7, 8, 9 to 18
 * Android API level 8 to 30 (Serialization support starting from Honeycomb)
 * Azul Zulu (tested on 1.8.0_45-b14)
 * Azul Zing JDK 1.8 (tested on 1.8.0-zing_16.10.1.0-b2)