('cachetools==3.1.1') is not allowed by your [versions]

[eduabumah001]

Hello,
when I run buildout install prod postgresql i got this error: ```
Requirement of ott.gtfsdb_realtime: cachetools==3.1.1
While:
Installing prod.
Error: The requirement ('cachetools==3.1.1') is not allowed by your [versions] constraint (3.1.0)

how can this be fixed please?

[fpurcell]

Todo: investigate further: @eduabumah001 is this an incompatability with gtfsdb? (e.g., I moved this issue from the gtfsdb repo, since gtfsdb doesn't use cachetools, etc...).