Bump version to 20201210

Bump version to 20201208

ruby-build 20201118

* Add TruffleRuby GraalVM 20.3.0

ruby-build 20201117

* bump version to openssl-1.1.1d to 1.1.1h

* bump version to openssl-1.1.0j to 1.1.1h

* bump version to openssl-1.1.1g to 1.1.1h

* Add TruffleRuby 20.3.0

bump version to 20201005

bump version to 20200926

ruby-build 20200819

* Add definition for JRuby 9.2.13.0

  JRuby 9.2.13.0 has been released.
  https://www.jruby.org/2020/08/03/jruby-9-2-13-0

* Add definition for mruby 2.1.2

* Add TruffleRuby 20.2.0

* Add GraalVM 20.2.0

ruby-build 20200727

* Fix installation of truffleruby+graalvm on macOS

ruby-build 20200722

* Fix a bash 4.4 warning when installing jruby

  In particular, the following:

  ```
  /path/to/bin/ruby-build: line 739: warning: command substitution: ignored null byte in input
  ```

* add mruby 2.1.1

* Added rbx-4.16 to 5.0

* compatible with macOS 11

* Add definition for JRuby 9.2.12.0

  https://www.jruby.org/2020/07/01/jruby-9-2-12-0.html

* Add support for installing GraalVM

  * Supports using other GraalVM languages such as JavaScript, Python, R and Java.
  * Supports running TruffleRuby on JVM and not only Native.
  * Add GraalVM 20.1.0.

* Rename definition to truffleruby+graalvm

  * '+' needs to be considered part of the name for --definitions and -l
    to see truffleruby and truffleruby+graalvm as separate.

ruby-build 20200520

* Fix artichoke-dev installer

  The existing install function wiped out the prefix that build_package_copy
  copied the binaries to. The subsequently created symlinks point to files
  that don't exist on disk.