Update docs on how to use transformation lib with proguard

[SzymonGrochowiak]

Hi, I am unsure whether I should create a bug or feature request for this.

Is your feature request related to a problem?

The transformation library is not working with proguard. I used com.github.skydoves:landscapist-transformation:2.1.10 dependency.
Using proguard causes crash:

Fatal Exception: java.lang.UnsatisfiedLinkError: No implementation found for long J5.a.b() (tried Java_J5_a_b and Java_J5_a_b__)
       at com.skydoves.landscapist.transformation.RenderScriptToolkit.createNative(RenderScriptToolkit.java)
       at com.skydoves.landscapist.transformation.RenderScriptToolkit.<clinit>(RenderScriptToolkit.java:12)
       at com.skydoves.landscapist.transformation.blur.RememberBlurPainterKt.iterativeBlur(RememberBlurPainter.kt:89)
       at com.skydoves.landscapist.transformation.blur.RememberBlurPainterKt.access$iterativeBlur(RememberBlurPainter.kt:89)
       at com.skydoves.landscapist.transformation.blur.RememberBlurPainterKt.rememberBlurPainter(RememberBlurPainter.kt:89)
       at com.skydoves.landscapist.transformation.blur.BlurTransformationPlugin.compose(BlurTransformationPlugin.java:89)
       at com.skydoves.landscapist.plugins.ImagePluginKt.composePainterPlugins(ImagePlugin.kt:56)
       at com.skydoves.landscapist.RememberPainterPluginsKt.rememberDrawablePainter(RememberPainterPlugins.kt:6)
       at com.skydoves.landscapist.glide.GlideImage__GlideImageKt$GlideImage$5.invoke(GlideImage__GlideImage.kt:6)
       at com.skydoves.landscapist.glide.GlideImage__GlideImageKt$GlideImage$5.invoke(GlideImage__GlideImage.kt:6)
       at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambdaImpl.java:50)
       at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambdaImpl.java:8)
       at com.skydoves.landscapist.ImageLoad__ImageLoadKt$ImageLoad$2.invoke(ImageLoad__ImageLoad.kt:122)
       at com.skydoves.landscapist.ImageLoad__ImageLoadKt$ImageLoad$2.invoke(ImageLoad__ImageLoad.kt:122)
       at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambdaImpl.java:50)
       at androidx.compose.runtime.internal.ComposableLambdaImpl$invoke$1.invoke(ComposableLambdaImpl.java:21)
       at androidx.compose.runtime.internal.ComposableLambdaImpl$invoke$1.invoke(ComposableLambdaImpl.java:21)
       at androidx.compose.runtime.RecomposeScopeImpl.compose(RecomposeScopeImpl.java:14)
       at androidx.compose.runtime.ComposerImpl.recomposeToGroupEnd(ComposerImpl.java:189)
       at androidx.compose.runtime.ComposerImpl.skipCurrentGroup(ComposerImpl.java:46)
       at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(ComposerImpl.java:71)
       at androidx.compose.runtime.ComposerImpl$doCompose$2$5.invoke(ComposerImpl.java:71)
       at androidx.compose.runtime.SnapshotStateKt__DerivedStateKt.observeDerivedStateRecalculations(SnapshotStateKt__DerivedState.kt:41)
       at androidx.compose.runtime.SnapshotStateKt.observeDerivedStateRecalculations(SnapshotState.kt:130)
       at androidx.compose.runtime.ComposerImpl.doCompose(ComposerImpl.java:130)
       at androidx.compose.runtime.ComposerImpl.recompose$runtime_release(ComposerImpl.java:32)
       at androidx.compose.runtime.CompositionImpl.recompose(CompositionImpl.java:18)
       at androidx.compose.runtime.Recomposer.performRecompose(Recomposer.java:68)
       at androidx.compose.runtime.Recomposer.access$performRecompose(Recomposer.java:68)
       at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$2.invoke(Recomposer.java:378)
       at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$2.invoke(Recomposer.java:378)
       at androidx.compose.ui.platform.AndroidUiFrameClock$withFrameNanos$2$callback$1.doFrame(AndroidUiFrameClock.java:6)
       at androidx.compose.ui.platform.AndroidUiDispatcher.performFrameDispatch(AndroidUiDispatcher.java:34)
       at androidx.compose.ui.platform.AndroidUiDispatcher.access$performFrameDispatch(AndroidUiDispatcher.java:34)
       at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.doFrame(AndroidUiDispatcher.java:12)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:977)
       at android.view.Choreographer.doCallbacks(Choreographer.java:791)
       at android.view.Choreographer.doFrame(Choreographer.java:723)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:965)
       at android.os.Handler.handleCallback(Handler.java:789)
       at android.os.Handler.dispatchMessage(Handler.java:98)
       at android.os.Looper.loop(Looper.java:164)
       at android.app.ActivityThread.main(ActivityThread.java:6759)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)

Describe the solution you'd like:

Provide clear instructions on how to set proguard rules for the transformations library. In my case, I excluded all classes in proguard file: -keep class com.skydoves.landscapist.transformation.** { *; } and it worked. Crash no longer occurs.

[skydoves]

@SzymonGrochowiak Thanks for reporting this issue! I will work on automatically includes this proguard in the next release.

[skydoves]

@SzymonGrochowiak This has been included in version 2.2.0. Thanks for reporting this issue!