Transformer is not compatible with coil 2.0

[mori-atsushi]

Coil will make a big breaking change in 2.0.
Now, many Transformation for Coil, including BlurTransformation, throw an AbstractMethodError and do not work with Coil 2.0.

At least the following two changes are required.

• Transformation.key is replaced with Transformation.cacheKey.
• BitmapPool and PoolableViewTarget have been removed from the library.

Since Coil 2.0 is alpha, it may changes until the stable release.

Can I make a Pull Request?

[wasabeef]

@mori-atsushi
Thank you for teaching me about that. if you make the PR, I'll check that.

[Qdafengzi]

update time ?