Bugfix release v0.5.1

[akoshunyadi]

Problem description The release v0.5.0 contains a few bugs which should be corrected in a v0.5.1. The release should be branched from the main branch, so no other commits should be performed before.

Content:

• fix: move "countryCode" out of "device" in ROAMING_CHANGE_COUNTRY-example - merged
• fix: add missing "subscriptionId" in "RoamingStatus"-data for CloudEvent - merged
• fix: change description that subscriptionExpireTime is optional - merged
• PRxx typo in error 400
• Updated in-line documentation for Roaming to clarify that country information can optionally be returned in the response

Expected action

• merge all necessary PRs
• create PR for release preparation
• create release

Additional context

[hdamker]

@akoshunyadi This is done and can be closed, right?

[akoshunyadi]

@akoshunyadi This is done and can be closed, right?

That's correct, thanks!