* main:
Prepare for release 2.11.1.
Update npm packages.
Bump @actions/core from 1.2.4 to 1.2.6
Update to gradle 6.7-rc-1 for test fixture. Build with Java 15 on CI.
Improve GitHub Actions Gradle cache.
Add square/radiography to adopter list
Add cashapp/copper to adapter list
SDK Build tools 30.0.2.
Update fixture dependencies.
Gradle 6.6.
Update README.md
Update packages.
Build tools 30.0.1.
Use fs for writing licence files.
Update cmdline-tools to 2.1.
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