doc: Remove Node report in core initiative

Remove `Node report in core` from Current list of
initiatives, as this is achieved. Report has landed.

Refs: nodejs/node#22712
PR-URL: #286
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michael Dawson <Michael_Dawson@ca.ibm.com>

README.md

@@ -21,7 +21,6 @@ Work needed includes:
 | Diagnostic Channel   | [@qard](https://github.com/qard)                 |                                              | https://github.com/nodejs/diagnostics/issues/180 |
 | Async Hooks          | [@ofrobots](https://github.com/ofrobots)         |                                              | https://github.com/nodejs/diagnostics/issues/124 |
 | Async Context        | [@mike-kaufman](https://github.com/mike-kaufman) | [@kjin](https://github.com/kjin)             | https://github.com/nodejs/diagnostics/issues/107 |
-| Node-report in core  | [@mhdawson](https://github.com/mhdawson)         | [@gireeshpunathil](https://github.com/gireeshpunathil) | https://github.com/nodejs/node/pull/22712  |
 | Support tiers        | [@mhdawson](https://github.com/mhdawson)         |                                              | https://github.com/nodejs/diagnostics/issues/157 |
 | CPU Profiling        | [@mmarchini](https://github.com/mmarchini)       |                                              | https://github.com/nodejs/diagnostics/issues/148 |
 | Post-mortem WG merge | [@mmarchini](https://github.com/mmarchini)       |                                              | https://github.com/nodejs/post-mortem/issues/48 |