Updates testing docs to remove @build_bazel_rules_nodejs reference.

Refs #63.

We recently updated the `jasmine_node_test()` wrapper to use `@aspect_rules_jasmine`, so this isn't really a "copy" of `@build_bazel_rules_nodejs'` `jasmine_node_test()`.

README.md

@@ -430,9 +430,8 @@ You can also use `npm run build` and `npm test` to build and test everything.
 ## Testing
 
 Most tests are run in [Jasmine](https://jasmine.github.io/) using
-`jasmine_node_test()`, a [custom `@aspect_rules_js` implementation](/tools/jasmine.bzl)
-which mirrors the
-[`@build_bazel_rules_nodejs` version](https://www.npmjs.com/package/@bazel/jasmine#jasmine_node_test).
+`jasmine_node_test()`, a
+[slightly customized implementation of `@aspect_rules_jasmine`](/tools/jasmine.bzl).
 These tests run in a Node Jasmine environment with no available browser (unless
 they depend on WebDriverIO). The test can be executed with a simple
 `bazel test //path/to/pkg:target`.