HY-1772 Release wf-common 0.3.1

PRs contained in this release:

https://github.com/Workiva/wf-common/pull/28
https://github.com/Workiva/wf-common/pull/25

Diff Between Last Tag and Proposed Release: https://github.com/Workiva/wf-common/compare/0.3.0...Release_0.3.1

How To +10/QA
-------------

```bash
# skip the following steps if you've already initialized the project
git clone git@github.com:Workiva/wf-common.git
cd wf-common

# do not skip these!
git fetch && git checkout Release_0.3.1
Run unit tests
```