Add release notes for Djblets 1.0.10.
Review Request #10415 — Created Feb. 18, 2019 and submitted — Latest diff uploaded
This release makes it easier to implement Avatar backends, fixes some
state sharing bugs in ConditionsField, adds disabling of From spoofing
in e-mails, and improves the testing capabilities for API resources.
Built the docs. Checked for build, spelling, and link errors.