Update readme on instrumentation tests

test/instrumentation/README.md

@@ -2,8 +2,6 @@
 
 These are tests where we run our breadcrumb instrumentation on a module, then run the instrumented module's original test suite to make sure we didn't break anything.
 
-We don't run these tests in CI; they have one-off harnesses and various requirements to run which may be tricky to provide in CI, and the results of these tests are unlikely to change without significant changes to instrumentation logic which would warrant running them manually during development.
-
 We have the following tests:
 - node core http (`node-http.test.js`)
 
@@ -13,13 +11,13 @@ We may add in the future:
 - any other node core modules we choose to instrument
 
 ### Usage:
-In short, you need to have node checked out to the proper version, then run `node node-http.test.js "/Path/to/node"`.
-
-Exact steps to run, starting from the directory above `raven-node`:
+We don't run these by default as part of `npm test` since they require a heavy download and take ~a minute to run, but we run them in CI. You can run them locally with:
+```
+npm run test-full
+```
+Or:
 ```bash
-git clone git@github.com:nodejs/node.git
-cd node
-git checkout -b v7.2.0 # replace 7.2.0 with whatever version of node you have installed
-cd ../raven-node/test/instrumentation
-node node-http.test.js "../../../node" # or /Path/to/your/clone/of/node"
+cd test/instrumentation
+./run.sh
 ```
+This will check what version of node you have, grab the source of that version, then run against that http test suite.