DOC-1100: old inifile causes agent run failure in PE 3.3

Added a warning about old, manually installed inifile modules cause failure of agent runs on master as of PE 3.3. User needs to update inifile module.

Bonus round: DOC-1267. Corrected a broken link in the contributor section.
Merge pull request #130 from jbondpdx/update-readme

DOC-1100: old inifile causes agent run failure in PE 3.3