By incrementing the minor version number, we break the rough connection we had between PR numbers and patch version numbers. This represents the fact that we're entering a phase in which the work is driven by issues (which are not sequential), rather than non-issue PRs (which can be sequential enough).
0.1.141
PR 142, built on pybind 2.4.3.
0.1.139
PR 144, built on pybind 2.4.3.
(The version numbers no longer correspond to the PR numbers. Issue numbers are becoming more important than PR numbers.)