更新pod版本

Fetching: cocoapods-core-1.1.0.beta.1.gem (100%)

ERROR:While executing gem ... (Errno::EACCES)

Permission denied - /Library/Ruby/Gems/2.0.0/cache/cocoapods-core-1.1.0.beta.1.gem

sudo gem install -n /usr/local/bin cocoapods

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