New Android requirements

[frmdstryr]

New requirements are coming... This means crystax builds of python will no longer work.

• August 2018: New apps required to target API level 26 (Android 8.0) or higher.
• November 2018: Updates to existing apps required to target API level 26 or higher.
• 2019 onwards: Each year the targetSdkVersion requirement will advance. Within one year following each Android dessert release, new apps and app updates will need to target the corresponding API level or higher.

https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html?m=1

[frmdstryr]

This should do it https://github.com/codelv/conda-mobile