Remove Prerelease Label

[nmanoogian]

After some internal evaluation, we've decided to move the operator out of "prerelease" status. The main drivers for this decision were:

• The number of Doppler users actively using the operator
• The number of requests made by the operator to the Doppler API
• The feedback received and re-incorporated by users of the operator

[nmanoogian]

Does this mean we're ready to release a v1.0.0?

Yessir! That'll be our next tag.