Registering current changes as v0.3.3

[wzhorton]

Is there anything preventing this repo from releasing/registering changes since v0.3.2? It looks like the current commit (7811acf) is passing all the checks and there hasn't been a commit for about a year. I found myself needing to use the Weeks method parameter optimizer, which is not functional in v0.3.2 due to a removed Optim dependency, but seems to work fine on the current commit (dependency reinstated with 6205482). Installing directly via GitHub is certainly a solution, but I'm just curious if there are lingering issues that would prevent releasing current changes as a v0.3.3

Many thanks!