socviz not installing

I ran the following code in R as mentioned in the introduction of the book:
`devtools::install_github("kjhealy/socviz")`

I got this error:
`Error: Failed to install 'unknown package' from GitHub:
  Unsupported proxy 'https://gate-zrh.swissre.com:9443', libcurl is built without the HTTPS-proxy support.`

Any help on this please?