Log Message:
pick: Update to 3.0.1

Patch provided by Jenz Guenther with minor adjustments by me.

Changes:
# v3.0.1 - 2019-03-10
## Bug fixes
- Honor `PREFIX` during configure.
  (adcba3c) (Anton Lindqvist)
- Honor `MANDIR` during configure and install.
  (8c56f54) (Aggelos Avgerinos)
- Honor `INSTALL_MAN` during configure and install.
  (869536f) (Leonardo Taccari)
- Honor `BINDIR` during configure and install.
  (434c496) (Anton Lindqvist)