Update to newest Kotlin

Would it be possible to update to version 1.4 of Kotlin? Currently, when I build my project it states this:

w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
    C:/Users/<user>/.gradle/caches/transforms-2/files-2.1/d67bdef0e9a095dce49b7313e8c22be7/jetified-kotlin-stdlib-jdk8-1.3.11.jar (version 1.3)
    C:/Users/<user>/.gradle/caches/transforms-2/files-2.1/a55336aceee8feb1d1f28ba064eccf9d/jetified-kotlin-stdlib-jdk7-1.4.10.jar (version 1.4)

It's ofcourse "just" a warning, but it would be nice to avoid. I'm not sure if there's other ways to avoid it (other than ignoring it), but a simple solution could be to just update to newest version of Kotlin (currently 1.4.10)

Library write in java, but app sample in kotlin. Is posible transcribe this library 100% kotlin version?

I like this library, but how implement it in Java? sample app in Kotlin, I have tried to understand but can't.

Finally, I can use this library in Java. Thanks to @sephiroth74 and thanks to om yohanes for helping me to use this library :) Sample in Java available here