3.26.0

Changelog

87fcc38 Add batch_change.{name,description} as templating variables (#491)
56a8639 Update alpine Docker tag to v3.13.2 (#482)
b106881 Update golang:1.16-alpine Docker digest to 0d62e9a (#481)
556ba8b changelog: prepare for 3.26.0
0c912e4 depend on codeintelutils from sourcegraph/sourcegraph (#483)
6b722ff go.mod: rename campaignutils to batch-change-utils (#490)
54fedaf s/campaign/batch change/ (#489)
ecd2663 search: add streaming client (#484)
35339a2 search: add support for streaming search (#485)