Gauge Ruby v0.6.0

• #290 - Fix build for Ruby 2.7+ and add arm64 variants
• #223 - Bump parser from 3.0.0.0 to 3.0.1.0
• #222 - Bump grpc-tools from 1.35.0 to 1.36.0
• #221 - Bump grpc from 1.35.0 to 1.36.0
• #219 - Bump grpc-tools from 1.32.0 to 1.35.0
• #218 - Bump yard from 0.9.25 to 0.9.26
• #217 - Update parser requirement from ~> 2.3 to >= 2.3, < 4.0
• #216 - Bump rake from 13.0.1 to 13.0.3
• #212 - Use released version of html report
• #211 - Update build scripts and remove deprecations
• #209 - Bump rspec from 3.9.0 to 3.10.0
• #208 - Bump simplecov from 0.19.0 to 0.19.1
• #205 - Bump parser from 2.7.1.5 to 2.7.2.0
• #204 - Bump parser from 2.7.1.4 to 2.7.1.5
• #203 - Bump grpc-tools from 1.31.1 to 1.32.0
• #202 - Bump grpc from 1.31.1 to 1.32.0
• #201 - Bump unparser from 0.4.8 to 0.4.9
• #200 - Bump unparser from 0.4.7 to 0.4.8
• #199 - Bump grpc from 1.30.2 to 1.31.1
• #198 - Bump grpc-tools from 1.30.2 to 1.31.1