Github install_github error setting certificate

Describes the cause and action for error messages.

Error Message(English)：
install_github error setting certificate

Resolution

error setting certificate verify locations: ・ Issue #116 ・ jeroen/curl ・ GitHub
https://github.com/jeroen/curl/issues/116

devtools package namespace-mangling + S4. ・ Issue #1 ・ r-lib ... - GitHub
https://github.com/r-lib/devtools/issues/1