Bump beta version
Bump beta version

brancz/alertmanager,Aloomaio/alertmanager,tbouvet/alertmanager,ericgerling/alertmanager,tinytub/alertmanager,novilabs/alertmanager,brancz/alertmanager,GoogleCloudPlatform/alertmanager,tyrken/alertmanager,brancz/alertmanager,brunoqc/alertmanager,ericgerling/alertmanager,sarathsp06/alertmanager,joehandzik/alertmanager,sarathsp06/alertmanager,tyrken/alertmanager,Kellel/alertmanager,tyrken/alertmanager,tyrken/alertmanager,brunoqc/alertmanager,prometheus/alertmanager,joehandzik/alertmanager,novilabs/alertmanager,Kellel/alertmanager,ericgerling/alertmanager,Aloomaio/alertmanager,tinytub/alertmanager,tbouvet/alertmanager,Kellel/alertmanager,prometheus/alertmanager,joehandzik/alertmanager,brancz/alertmanager,GoogleCloudPlatform/alertmanager,tinytub/alertmanager,brunoqc/alertmanager,Aloomaio/alertmanager,prometheus/alertmanager,novilabs/alertmanager,novilabs/alertmanager,sarathsp06/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,tbouvet/alertmanager,brunoqc/alertmanager