Grafana did not update to 5.1 when upgrading from versions older than 1.12

STR: 

1) install PMM  1.11 or 1.10 

2) Update PMM  (button way )

Expected results: Grafana 5.1.3  version installed 

Given results: Grafana 5.0.4  still  on system 

The  problem:  (possible ) During implementation  PMM-2561  we forgot to change  https://github.com/percona/pmm-update/blob/6c26d01f17e003a8d36eb277c1e9aa16209c59d9/ansible/v011400/main.yml#L79:19   (see previous commits and  ansible files)

Possible solution:  change this one line 

note: in  you  have  installed 1.12  (not updated) - everything OK