Fix example class OddInt

[midhun-pm]

Checklist
- [ ] Tests
- [ ] Update API reference (docs/source/traits_api_reference)

• Update User manual (docs/source/traits_user_manual)
  - [ ] Update type annotation hints in traits-stubs

PR fixes #486
Make the OddInt example class inherit from BaseInt which does not have a fast validator.

[codecov-io]

Codecov Report

Merging #973 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #973      +/-   ##
==========================================
+ Coverage   73.02%   73.20%   +0.18%     
==========================================
  Files          51       51              
  Lines        6505     6497       -8     
  Branches     1307     1305       -2     
==========================================
+ Hits         4750     4756       +6     
+ Misses       1364     1350      -14     
  Partials      391      391              

Impacted Files	Coverage Δ
traits/editor_factories.py	79.59% <0.00%> (-9.19%)	⬇️
traits/trait_base.py	62.98% <0.00%> (-0.60%)	⬇️
traits/trait_types.py	71.57% <0.00%> (+0.07%)	⬆️
traits/traits.py	76.92% <0.00%> (+4.04%)	⬆️
traits/etsconfig/etsconfig.py	63.46% <0.00%> (+6.41%)	⬆️

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[mdickinson]

Thanks for this. Looks good (modulo one nitpick).

There are a couple of other places in new_types.py, that have the OddInt(Int) example in docstrings. Could we update those, too?

[midhun-pm]

Changed Int to BaseInt in new_types.py also.

[mdickinson]

LGTM. Thank you!