mtools 1.6.1

Highlights of this release are:

• mtools should use python3 in shebangs (#761)
• mloginfo: add timezone to mloginfo summary (#258)
• mloginfo --clients: more robust parsing of client metadata (#765)
• mloginfo --queries: fix missing patterns for remove command (#742)
• mloginfo --queries: add rounding option (#698)
• mplotqueries: fix error parsing checkpoint log line (#757)

Thanks to @stennie, @kallimachos, @kevinadi, @niccottrell, and @p-mongo
for contributions to this release.

To install, run:

pip3 install mtools --upgrade

See Changes to mtools for a full change history.