v0.11.2: Bugfixes (mbbi support and open62541 crashes)

Fixed bugs

• enums (mbbi) were not reading their enum strings if the initially read value was invalid
• open62541: crash on server disconnect, when read_array() is called with NULL
• to avoid a race condition, add a workaround to make sure that the initial read is completed before starting monitors.

Updating to release 0.11.2 (from 0.11) is considered low-risk for all users.

Thanks to Dirk Zimoch for these fixes.
As always: Please report any unexpected findings in the issue tracker.

Full Changelog: v0.11.1...v0.11.2