fix(queryAllBySelectText): search using reactive properties (#124)

<!--
Thanks for your interest in the project. Bugs filed and PRs submitted are appreciated!

Please make sure that you are familiar with and follow the Code of Conduct for
this project (found in the CODE_OF_CONDUCT.md file).

Also, please make sure you're familiar with and follow the instructions in the
contributing guidelines (found in the CONTRIBUTING.md file).

If you're new to contributing to open source projects, you might find this free
video course helpful: http://kcd.im/pull-request

Please fill out the information below to expedite the review and (hopefully)
merge of your pull request!
-->

<!-- What changes are being made? (What feature/bug is being fixed here?) -->

**What**:

Replace the existing select query mechanism which uses `HTMLSelectElement .selectedOptions` with a query that searches for the `selected` attribute of an `HTMLOptionElement`.

<!-- Why are these changes necessary? -->

**Why**:

Closes #115.

Since `selectedOptions` is not a reactive property, JSDOM was not updating to match the selected option in a select Element. The `selected` attribute is reactive.

<!-- How were these changes implemented? -->

**How**:

Instead of iterating through `selectedOptions` of an HTMLSelectElement, we iterate through all HTMLSelectOptions and isolate the ones that are selected.
<!-- Have you done all of these things?  -->

I've gone ahead and tested this locally to make sure that it would be reactive! 👍 

**Checklist**:

<!-- add "N/A" to the end of each line that's irrelevant to your changes -->

<!-- to check an item, place an "x" in the box like so: "- [x] Documentation" -->

- [ ] Documentation N/A
- [ ] Tests N/A
- [x] Ready to be merged <!-- In your opinion, is this ready to be merged as soon as it's reviewed? -->
- [x] Added myself to contributors table <!-- this is optional, see the contributing guidelines for instructions -->

<!-- feel free to add additional comments -->

src/queries.js

@@ -134,11 +134,14 @@ function queryAllBySelectText(
 ) {
   const matcher = exact ? matches : fuzzyMatches
   const matchOpts = {collapseWhitespace, trim}
-  return Array.from(container.querySelectorAll('select')).filter(selectNode =>
-    Array.from(selectNode.selectedOptions).some(optionNode =>
+  return Array.from(container.querySelectorAll('select')).filter(selectNode => {
+    const selectedOptions = Array.from(selectNode.options).filter(
+      option => option.selected,
+    )
+    return selectedOptions.some(optionNode =>
       matcher(getNodeText(optionNode), optionNode, text, matchOpts),
-    ),
-  )
+    )
+  })
 }
 
 function queryBySelectText(...args) {