* Add support for aarch64
* Add ARM64 build to Travis CI build matrix
* Add JDK data for aarch64
* Add support for armv7l
* Add JDK data for armv7l/arm32-vfp-hflt
* Use `arm64` (Apple M1 on Darwin) as alias for `aarch64`
Refs: https://developer.apple.com/forums/thread/668206
> ```
> # uname -a
> Darwin MacBook-Pro.local 20.1.0 Darwin Kernel Version 20.1.0: Sat Oct 31 00:07:10 PDT 2020; root:xnu-7195.50.7~2/RELEASE_ARM64_T8101 arm64
> ```
* Update JDK data
Use Travis variables to pass the location where relevant code (i.e. the
branch/PR being tested) is checked out on the worker instead of passing
repo master URL to `plugin-test` command.
Closes#21