fix instrumenter signature

Author: jsumners-nr

lib/instrumentation/superagent.js

@@ -8,7 +8,7 @@
 const http = require('http')
 const METHODS = http.METHODS.map((method) => method.toLowerCase())
 
-module.exports = function instrument(shim, superagent) {
+module.exports = function instrument(agent, superagent, moduleName, shim) {
   shim.wrapExport(superagent, function wrapRequest(shim, request) {
     if (!shim.isFunction(request)) {
       shim.logger.debug('Not wrapping export, expected a function.')