v4.2.0

• Additional lit filter updates (PR #141)
  • Allow snake case custom_element in addition to customElement
  • Process the render function even when it contains multiple statements
  • Fix a properties vs styles typo for <es2022
  • Automatically add the html tagged literal return when necessary for any method, not just render
  • Ensure any ivars prefixed with _ will not turn into reactive properties (if you truly need to maintain private internal state).
• ruby2js cli interface added
• esm autoimports & defs: fix Opal-based parser to handle hash generated by Ruby
• esm filter: convert top level requires into imports
• lit filter: updates from polymer LitElement to Lit v2.
  added: customElements, es2022 syntax for properties,
  query, queryAll, queryAsync
  inherited methods: performUpdate, requestUpdate
  inherited properties: hasUpdated, renderRoot, shadowRoot, updateComplete