Bump beta version
Bump beta version

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