databases/pspg: Update to 1.2.2

Changelog:

• https://github.com/okbob/pspg/releases/tag/1.2.1
• https://github.com/okbob/pspg/releases/tag/1.2.2

PR: 229910
Submitted by: Dmitri Goutnik <dg@syrec.org> (maintainer)
MFH: 2018Q3