added consumer-rules.pro for consumer proguard rules

[gsrathoreniks]

Includes consumer-rules.pro for:

cascade/cascade/src/main/java/me/saket/cascade/toolbar.kt

Line 122 in 80fcf2d

MenuBuilder::class.java.getDeclaredField("mPresenters").also {

and

cascade/cascade/src/main/java/me/saket/cascade/toolbar.kt

Line 134 in 80fcf2d

.firstOrNull { it::class.qualifiedName == "androidx.appcompat.widget.ActionMenuPresenter" }

[gsrathoreniks]

Fixes for : #31

[saket]

Thank you! Is there a good way to verify this using tests?

[gsrathoreniks]

Not one that I know of currently, If you can think of something, do let me know.