release: published 5.9.1

### 5.9.1 (2019-05-28):

* moved third party notices to

* Shim#require will now operate as expected.

  Previously, the module interception code made the faulty assumption that a module's
  filepath would be resolved before the module load call was invoked. This caused
  the wrap filepath to be attributed to the modules being instrumented. This meant
  that attempted relative require calls using Shim#require would resolved from the
  incorrect path. The logic has been changed to keep a stack of the resolved
  filepaths, resolving the issue.

* Updates error message for license check to indicate all places that need to be
  updated.

* Shim#wrapReturn now uses ES6 proxies to wrap its methods.

  This will accurately propagate look up and assignment onto the underlying wrapped
  function, while maintaining all previous functionality.

* Updated versioned test configurations to reflect current engine support.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "newrelic",
-  "version": "5.9.0",
+  "version": "5.9.1",
   "author": "New Relic Node.js agent team <[email protected]>",
   "license": "SEE LICENSE IN LICENSE",
   "contributors": [