更新 rubygems 報錯
/Library/Ruby/Site/2.6.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'ffi' (>= 1.3.0) among 80 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/tudd/.gem/ruby/2.6.0:/Library/Ruby/Gems/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0', execute `gem env` for more information
/// 解決辦法
1. brew reinstall cocoapods
2. brew link --overwrite cocoapods
