Bump version to 0.0.4

- Fix void element bug (#14)
  - Void elements like <img> should not have any children
    (even an empty array `[]` counts as children)
- Pass `key` to the `replace` method as the second parameter
  - Prevent React "key" warning
- Update tests, mocks, and helpers
- Update README with update on `replace` method

package.json

@@ -1,6 +1,6 @@
 {
   "name": "html-react-parser",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "description": "An HTML to React parser.",
   "author": "Mark <[email protected]>",
   "main": "index.js",