Add Jython 2.7.2b2 links

[jeff5]

Updates linking the beta of 2.7.2. I've done this by editing on GitHub directly, as I was too lazy to install the Ruby, Bundler, Jekyll stack for a simple addition. Have I missed anything?

I like the way the 2.7.2b2 Javadoc has just magically appeared without me doing anything.

[adamburkegh]

One minor comment

[adamburkegh]

Elimination (normally) of the Java 9+ ...

[jamesmudd]

Tested locally and looks good to me. Thanks for your work on this.

[jeff5]

Sorry, just too late for your review responding to Adam's spot, and a few more changes to news.md only.

[ctrueden]

I was too lazy to install the Ruby, Bundler, Jekyll stack for a simple addition.

I do this using Conda now:

brew install miniconda
conda create -n gh-pages rb-github-pages
conda activate gh-pages
bundle exec jekyll serve

I like it much more than installing Jekyll the normal way. To uninstall, you can just conda env remove -n gh-pages and boom, it's gone.