build(deps-dev): bump ipdb from 0.11 to 0.12.2

Bumps [ipdb](https://github.com/gotcha/ipdb) from 0.11 to 0.12.2.
- [Release notes](https://github.com/gotcha/ipdb/releases)
- [Changelog](https://github.com/gotcha/ipdb/blob/master/HISTORY.txt)
- [Commits](gotcha/ipdb@0.11...0.12.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements/dev.txt

@@ -3,7 +3,7 @@ check-manifest==0.37
 cogapp
 flake8==3.7.9
 hg+https://nicfit@bitbucket.org/nicfit/sphinxcontrib-bitbucket
-ipdb==0.11
+ipdb==0.12.2
 nicfit.py[cookiecutter]==0.8.5
 paver
 pss==1.42