Make sure you have the latest version of the Xcode command line tools installed:
xcode-select --install
Install fastlane using
[sudo] gem install fastlane -NV
or alternatively using brew install fastlane
fastlane publish
fastlane build_runner
fastlane icons
This README.md is auto-generated and will be re-generated every time fastlane is run. More information about fastlane can be found on fastlane.tools. The documentation of fastlane can be found on docs.fastlane.tools.