Add 'version' command about orbit-db-cli

[haadcode]

This was done by @prabodhmeshram in #5.

Thank you for contributing! 🎉

[prabodhmeshram]

Hi @haadcode, I could take a stab on this.

[haadcode]

@prabodhmeshram absolutely! Thanks you for jumping in ❤️

Take a look at the commands in src/commands/ for a reference, perhaps id is a good example.

What you should do is add version.js to src/commands/ and put everything in that one file. It'd be great to have one test for this (just to make sure it return the right version number and works). See test/ for a test example.

Is that enough for you to get started?

[haadcode]

@prabodhmeshram note that I just merged a new version to master, you should use that as your starting point.

[prabodhmeshram]

Sure @haadcode, Thanks for the info. Well I did forked the repo and started to look into the application structure. I tried to install the cli through npm and github as mentioned in the readme, but it failed for me.

Below is the error when installing from npm:

npm ERR! code 1
npm ERR! Command failed: /usr/bin/git checkout fix/default-filename
npm ERR! error: pathspec 'fix/default-filename' did not match any file(s) known to git.
npm ERR! 

Below is the error when installing from github:

npm ERR! code 128
npm ERR! Command failed: /usr/bin/git checkout 356c9e9d162a8148e7946db51121ea9d468c4f48
npm ERR! fatal: reference is not a tree: 356c9e9d162a8148e7946db51121ea9d468c4f48
npm ERR! 

My system Specs:
OS : Ubuntu 14.04
Node : v8.1.0
Npm : 5.0.3

Am I doing something wrong. Can you please guide me on this. Let me know If I am missing something. Thanks for your help

[prabodhmeshram]

Npm install worked for me after I took the latest changes from the repo.