Bump pyrsistent from 0.15.1 to 0.15.2
Bump pyrsistent from 0.15.1 to 0.15.2

Bumps [pyrsistent](https://github.com/tobgu/pyrsistent) from 0.15.1 to 0.15.2.
- [Release notes](https://github.com/tobgu/pyrsistent/releases)
- [Changelog](https://github.com/tobgu/pyrsistent/blob/master/CHANGES.txt)
- [Commits](https://github.com/tobgu/pyrsistent/compare/v0.15.1...v0.15.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Harmon758/Harmonbot,Harmon758/Harmonbot