0.3.3 prep

[benjeffery]

Tidy up changelogs and set python version number.

[AdminBot-tskit]

📖 Docs for this PR can be previewed here

[codecov]

Codecov Report

Merging #1047 (7eecb17) into main (bad0a89) will increase coverage by 1.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1047      +/-   ##
==========================================
+ Coverage   92.52%   93.68%   +1.15%     
==========================================
  Files          10       26      +16     
  Lines       11335    20985    +9650     
  Branches        0      875     +875     
==========================================
+ Hits        10488    19659    +9171     
- Misses        847     1289     +442     
- Partials        0       37      +37     

Flag	Coverage Δ
c-tests	92.49% <ø> (ø)
lwt-tests	92.80% <ø> (ø)
python-c-tests	94.82% <100.00%> (?)
python-tests	98.61% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/tskit/_version.py	100.00% <100.00%> (ø)
c/tskit/core.h	100.00% <0.00%> (ø)
python/tskit/vcf.py	100.00% <0.00%> (ø)
python/_tskitmodule.c	91.31% <0.00%> (ø)
python/tskit/exceptions.py	100.00% <0.00%> (ø)
python/tskit/__init__.py	100.00% <0.00%> (ø)
python/tskit/trees.py	97.46% <0.00%> (ø)
python/tskit/util.py	100.00% <0.00%> (ø)
python/tskit/stats.py	100.00% <0.00%> (ø)
... and 9 more

---

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[jeromekelleher]

LGTM!

[benjeffery]

Great, we're just waiting on #1023. Then will merge this, check the wheels and release!