Remove versionchanged/added directives from before 1.0

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (01ac5e6) 92.46% compared to head (b503ad2) 92.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #575 +/- ## ======================================= Coverage 92.46% 92.46% ======================================= Files 28 28 Lines 2961 2961 ======================================= Hits 2738 2738 Misses 223 223 ```

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[hugovk]

I looked up some numbers, about 5% are still using a 0.x version!

[claudep]

We can pause this PR if you like, however the most recent deleted directive, 0.9.5, was released on March 2011!

[hugovk]

That's quite a while ago! I'm guessing systems with such old versions aren't in a rush to upgrade the new features!

Feel free to merge once the conflict is resolved.