homebrew 升级报错 LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

报错信息

zqm:~ $ brew update
Warning: No available formula with the name "ca-certificates".
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.
Error: 
  homebrew-cask is a shallow clone.
To `brew update`, first run:
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
This command may take a few minutes to run due to the large size of the repository.
This restriction has been made on GitHub's request because updating shallow
clones is an extremely expensive operation due to the tree layout and traffic of
Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you
automatically to avoid repeatedly performing an expensive unshallow operation in
CI systems (which should instead be fixed to not use shallow clones). Sorry for
the inconvenience!
zqm:~ $ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
fatal: unable to access 'https://github.com/Homebrew/homebrew-cask/': LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443 
zqm:~ $ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
^C
zqm:~ $ 

原因：github现在使用token登录

vim .bash_profile
配置github的token： HOMEBREW_GITHUB_API_TOKEN