Publish 0.13.1 to include essential texture methods missing from 0.13
Publish 0.13.1 to include essential texture methods missing from 0.13

Without these methods, it's significantly more difficult to use a
texture as an image within a nannou `Ui`. I didn't pick up on this until
trying to update the [spatial audio
server](https://github.com/museumsvictoria/spatial_audio_server)

MindBuffer/nannou