Some very light markup is all that's needed. The underline with ====
makes each version into a linkable title and allows a table of contents
to be generated, while the `::` and blank line denotes that the rest is
a literal block.
I also shortened some very long lines, for readability.
We may want to use .rst formatting for these eventually, and maybe move
the NEWS file to docs/News.rst and docs/History.rst - but for now
including the raw text works well enough.