Summary: Added an arg for "build-plugin" command to easily set min required flipper version when plugin is packaged. Before that we only saved engine version in Marketplace metadata, but it's better to save it into the package as well, so we can check compatibility for installed packages even when we have no Marketplace metadata for them.
Reviewed By: passy
Differential Revision: D28350276
fbshipit-source-id: 916d891540263a1f99c1f6d2033eb13e1c36d78f