2.3.21

• Added systemd unit file (bacaldwell, gc issue #42)
  SystemVinit script support is dropped.
• Build against -lnetsnmp not -lsnmp(TOSS-2815)
• Add raritan-px5523.dev (Daryl Granau, TOSS-2486)

v2.3.20

• add dist tag to release (TOSS-2667)
• Minor automake updates

v2.3.19

• Added apc8941.dev (TOSS-2658, Tim Randles)

v2.3.18

• Stop tracking autotools products
• Add README.md for github move