README.md in telnyx-3.0.0 vs README.md in telnyx-3.0.2

@@ -159,17 +159,41 @@
    Telnyx.log_level = Telnyx::LEVEL_INFO
    ```
 
 ## Development
 
-The test suite depends on [telnyx-mock], so make sure to fetch and run it from a
-background terminal ([telnyx-mock's README][telnyx-mock] also contains
-instructions for installing via Homebrew and other methods):
+### Setup
+The test suite depends on the [Prism Mock Server](https://github.com/stoplightio/prism).
 
-    go get -u github.com/telnyx/telnyx-mock
-    telnyx-mock
+```bash
+npm install -g @stoplight/prism-cli
 
+# OR
+
+yarn global add @stoplight/prism-cli
+```
+
+Once installed, start the prism mock service with the following command:
+
+```bash
+prism mock https://raw.githubusercontent.com/team-telnyx/openapi/master/openapi/spec3.json
+```
+
+--------
+
+One final step -- because the Ruby SDK originally expected to reach the legacy `telnyx-mock` service at port 12111 (in addition to providing a `/v2/` base path), we need to setup a proxy server.
+
+You can do this any way you wish, but included is a server.js file which you can utilize:
+
+```bash
+# In new terminal window
+
+node server.js
+```
+
+### Running Tests
+
 Run all tests:
 
     bundle exec rake test
 
 Run a single test suite:
@@ -185,12 +209,9 @@
     bundle exec rake rubocop
 
 Run guard:
 
     bundle exec guard
-
-Update the bundled [telnyx-mock] by editing the version number found in
-`.travis.yml`.
 
 ### Adding a new resource
 
 To add a new resource: