5.0.0

Details on breaking changes:

1. Adds support for genuine ESM in Node (type and exports in package.json and
   changed main path).
2. Changes browser paths to include "-browser" in the file name
3. Adds browser to package.json to point to browser build for browser-specific bundling.
   Rollup users wishing the browser bundle must ensure @rollup/plugin-node-resolve
   has mainFields to include browser as the first item in the array; Webpack users may
   need to set resolve with aliasFields: ['browser'] and/or
   mainFields: ['browser', 'module', 'main'], ensuring that browser is in the front of the list
4. Has module point to the Node-specific build (with a new path)

Changes

• Breaking change: Add type: 'commonjs' and exports: {import, require}
  (with node-import-test npm script to demo)
• Breaking change: Change paths for browser (now is
  dist/index-browser-umd.js or dist/index-browser-es.js)
  (for Node, main and module point to new Node-specific dist)
• Breaking enhancement: Add browser for browser bundling;
  allowing static analysis environments, doesn't have however
  conditional code to require vm); for ESM browser bundling,
  now must check browser in Rollup Node resolver plugin;
  see README
• Build: Update per latest devDeps.
• Docs: Add Regex (.match) example on value (@jeffreypriebe)
• Docs: Add Regex (.match) example on property
• Docs: Fix XPath example (@humbertoc-silva)
• Docs: Link to XPath 2.0 tester
• Docs: Update badges per latest updates
• Linting: quote props
• Linting: As per latest ash-nazg
• Testing: Fix browser tests
• Testing: Add test case for setting values in callbacks (issue #126)
• Testing: Add more at-sign tests
• Testing: Bump timeout
• Travis: Check Node 14
• Travis: add default dist field to avoid extra config reporting
• npm: Update from deprecated rollup-plugin-babel to @rollup/plugin-babel
  (and make babelHelpers explicit)
• npm: Reorder scripts by test execution order
• npm: Update devDeps