Version 0.3.0 Changes: * Move metric metadata from registry to metrics * Rename special `name` label to `__name__` * Prevent usage of reserved label names starting with `__` * Forbid varying label sets Features: * Allow labels configuration in Rack middleware (thanks @porras) * Add support for text format * Implement Pushgateway support Misc: * Add Content-Type negotiation * Clean up Ruby code * Add full test coverage Full changeset: https://github.com/prometheus/client_ruby/compare/v0.2.0...v0.3.0