Having a set version number (66.0) is bad in case you forget to update your README. This just makes it so anyone installing will always get the latest version.
I think installing specific version is good, because installing latest version could break your app. Chromium changes happen all time and thus compatibility breaks are inevitable.
Having a set version number (66.0) is bad in case you forget to update your README. This just makes it so anyone installing will always get the latest version.