Only accept current version(s)

[TobiGr]

We are getting a bunch of reports for old versions. Who cares about people reporting issues which happend versions ago? There is a check to sort out errors which occurred more than 30 days ago, but that does not help when people run outdated versions.
We should probably only accept the latest version or the current major versions (like all reports from 0.18.x)

CC @wb9688

[TheAssassin]

The 30 days check is there because Sentry refuses to accept older issues, mainly.

Can/should we fix this problem on the Sentry side perhaps?