Fix #632: drop Kotlin 1.4 support (#643)

Author: cowtowncoder

.github/workflows/main.yml

@@ -23,7 +23,8 @@ jobs:
       fail-fast: false
       matrix:
         java_version: ['8', '11', '17']
-        kotlin_version: ['1.4.32', '1.5.32', '1.6.21', '1.7.20']
+        # Jackson 2.15 drops support for Kotlin 1.4, adds 1.8
+        kotlin_version: ['1.5.32', '1.6.21', '1.7.20', '1.8.10', '1.8.20-RC']
         os: ['ubuntu-20.04']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"

README.md

@@ -130,6 +130,7 @@ println(arrayNode.toString()) // ["foo",true,1,1.0,"YmFy"]
 Different `kotlin-core` versions are supported by different Jackson Kotlin module minor versions.
 Here is an incomplete list of supported versions:
 
+* Jackson 2.15.x: Kotlin-core 1.5 - 1.8
 * Jackson 2.14.x: Kotlin-core 1.4 - 1.7
 * Jackson 2.13.x: Kotlin-core 1.4 - 1.7
 

pom.xml

@@ -59,12 +59,11 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <!-- 16-Oct-2019, tatu: No point trying to target Java 7, Java 8 needed for build anyway -->
         <javac.src.version>1.8</javac.src.version>
         <javac.target.version>1.8</javac.target.version>
 
         <version.kotlin>1.5.32</version.kotlin>
-
+	
         <!-- Generate PackageVersion.java into this directory. -->
         <packageVersion.dir>com/fasterxml/jackson/module/kotlin</packageVersion.dir>
         <packageVersion.package>${project.groupId}.kotlin</packageVersion.package>