The bumping of version 0.2.0 → 0.3.0 was likely forgotten, looking at the code repository.
I downloaded the 0.3.0 binary slack-advanced-exporter-linux-amd64 and it states:
NAME:
Slack Advanced Exporter - A tool to augment official Slack data exports with additional data that Slack does not include by default.
USAGE:
slack-advanced-exporter-linux-amd64 [global options] command [command options] [arguments...]
VERSION:
0.2.0
[...]
The bumping of version 0.2.0 → 0.3.0 was likely forgotten, looking at the code repository.
I downloaded the 0.3.0 binary slack-advanced-exporter-linux-amd64 and it states: