Use `refute_` instead of `assert_not_` as they have been deprecated
Use `refute_` instead of `assert_not_` as they have been deprecated

zoul/open-data-certificate,ahmadassaf/open-data-certificate,ahmadassaf/open-data-certificate,Motejl/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,zoul/open-data-certificate,theodi/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,zoul/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,ahmadassaf/open-data-certificate