Adding CHANGELOG and VERSION.yml file. Bump version to 0.3.0

Author: kigster

CHANGELOG.md

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+# 0.3.0 / 2020-03-02
+
+[Total Changes since v0.2.0](https://github.com/bazelruby/rules_ruby/compare/v0.2.0...v0.3.0)
+
+**2,221 additions and 631 deletions in 71 changed files.**
+
+## Backwards Incompatible Changes
+
+* Main workspace has been renamed from `bazelruby_ruby_rules` to `bazelruby_rules_ruby`
+* Global function `ruby_register_toolchains` has been renamed to `rules_ruby_select_sdk`
+* Global function `ruby_rules_dependencies` has been renamed to `rules_ruby_dependencies`
+* `bundle_install` has been removed in favor of `ruby_bundle`.
+
+## Other Changes
+
+* Introduced `ruby_gem` rule for packaging Ruby sources into a RubyGem-compatible zip file. Note, the resulting file has `.zip` extension.
+* Introduced `ruby_rubocop` rule for running rubocop in analysis mode or auto-correcting mode.
+* Added an example gem workspace under `examples/example-gem`
+* Default ruby used is now 2.7.0. We also now allow 2.7.0 to be built by Bazel.
+* Bazelisk has been updated to 1.3.0
+* Updated Bazel version from 2.0.0 to 2.1.0
+* Updated gem versions in the Gemfile
+* Changed how the `ruby_bundle` pulls gem's folders into the bundle to include additional files.
+* Many other small changes, for full list [please see the diff](https://github.com/bazelruby/rules_ruby/compare/v0.2.0...v0.3.0).
+
+# 0.2.0 / 2020-12-30
+
+[Total Changes since v0.1.0](https://github.com/bazelruby/rules_ruby/compare/v0.1.0...v0.2.0)
+
+# 0.1.0 / 2019-11-20
+
+* Initial migration from [Yugui](https://github.com/yugui) rules ruby.

VERSION.yml

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+rules_ruby:
+  version: 0.3.0
+    
+
+