Minor: Operator spacing and naming consistency
Minor: Operator spacing and naming consistency

By convention, there should be a space before and after a string concatenation operator.
Also, both submit buttons should use a dash to separate the static and variable parts of the element ID.
adigital/plugin-update-checker,adigital/plugin-update-checker,YahnisElsts/plugin-update-checker,YahnisElsts/plugin-update-checker