languageserversetup::languageserver_install() yields "SSL connect error"

[yulang-wang]

On a fresh installation of languageserversetup in R 3.3.1 (2016-06-21), the following command to install languageserver fails as follows:

> languageserversetup::languageserver_install()
This will attempt to use:
source('https://install-github.me/REditorSupport/languageserver')
to install REditorSupport/languageserver into:
/home/xxx/languageserver-library
All dependencies will also be installed there

Do you agree? (yes/No/cancel) yes
Error in file(filename, "r", encoding = encoding) : 
  cannot open connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  URL 'https://install-github.me/REditorSupport/languageserver': status was 'SSL connect error'