Add final task to announce the release

[hugovk]

Add a final task, just before "Congratulations, Python 3.xx.y is released 🎉🎉🎉":

Have you announced the release at https://discuss.python.org/c/core-dev/23 and https://www.blogger.com?
Tip: use the 'release' tag and 'releases' label respectively.
Enter yes or no:

Now links are right there in the terminal and ready to click.

[ezio-melotti]

One thing I often do in similar cases is to use webbrowser.open and rephrase the question to "Do you want to open <url> to make the announcement? (Select no if you announced it already)".
(Depending on the terminal a single click might not always work.)

[hugovk]

Yeah, considered that also and will look into it for a followup. There are a few places it could be useful to pop open the browser, and will also check it's ok with the other RMs.