fix readme traceID generate method (#1687)

* fix readme traceID generate method

* remove util

Co-authored-by: Nev <54870357+MSNev@users.noreply.github.com>

README.md

@@ -420,7 +420,7 @@ Breaking changes in the SDK V2 version:
 - ES3 (IE8) compatibility, while running in IE8 or lower versions of the browser is not an officially supported scenario we are working to maintain ES3 level compatibility to ensure that the SDK will not cause any unexpected failures due to Javascript parsing error. See [ES3/IE8 Compatibility](#es3ie8-compatibility) below for further information.
 - Telemetry envelope has field name and structure changes due to data schema updates.
 - Moved `context.operation` to `context.telemetryTrace`. Some fields were also changed (`operation.id` --> `telemetryTrace.traceID`)
-  - If you want to maunally refresh the current pageview id (e.g. in SPA apps) this can be done with `appInsights.context.telemetryTrace.traceID = Util.newId()`
+  - If you want to maunally refresh the current pageview id (e.g. in SPA apps) this can be done with `appInsights.context.telemetryTrace.traceID = generateW3CId()`
 
 If you are using the current application insights PRODUCTION SDK (1.0.20) and want to see if the new SDK works in runtime, please update URL depending on your current SDK loading scenario: