Update README.md and CHANGELOG.md

[wasky]

No description provided.

[burhanrashid52]

@wasky We Need to update the saving example with the coroutine one. We also need to keep the old one as well.

[wasky]

We also need to keep the old one as well.

Is it related to #511 and you want to keep Java support?

[burhanrashid52]

We also need to keep the old one as well.

Is it related to #511 and you want to keep Java support?

Yes. For documentation purposes.

[wasky]

I would introduce new API before the release rather than keep the old one in docs. The reason for this is the exception handling. In current old version of API and in AsyncTask version of API you can't handle potential exceptions from the lib. In new API this will work:

try {
    photoEditor.saveAsFile(...)
} catch(e: Exception) {
    //
}

I made a PR with new API for Java (#512) and changed the README in this PR to show example usage of new API for borh Java and Kotlin.

[burhanrashid52]

@wasky I've published the jar. Can you update the documentation?
Also, do you have a Twitter handle?