devel/transifex-client: update to 0.13.11

Update transifex-client to 0.13.11.

0.13.8 (2020-03-13)

* Tx-client is now able to follow any symbolic links while pushing content
  to Transifex.

0.13.9 (2020-04-07)

* Fixing a symlink issue.

0.13.10 (2020-06-12)

* New flag to compare file timestamp through git and slugify update.

0.3.11 (2020-07-09)

* New flag to compare file timestamp through git and slugify update.

(taca)