Change pip install syntax

[bcb]

From:

pip install jsonrpcclient requests

To:

pip install 'jsonrpcclient[requests]'

Original comment by @saaj, here.

[bcb]

+1 This should be done.

Prior to python 2.7.9, requests needs to be installed as requests[security], due to recent OpenSSL changes. So it might need an additional requests-security option in extras_require. Created issue #31 for that.

[bcb]

In my shell (zsh) it requires quotes, pip install 'jsonrpcclient[requests]'.

Without them it says zsh: no matches found: jsonrpcclient[requests].