Zenbot: Update documentation for Windows users

[DeviaVir]

Just recommend them to use Docker now that we have introduced TA-Lib and forex.analytics (which both break Windows support).

related to #385 and #285

[cmroche]

It is still possible to build on Windows 10, but you'll need to install the "Bash and Linux Subsystem" option from the Windows Features, then enable developer mode in the PC developer's settings. It can be fully built from within the windows bash shell now.

[trivalik]

Since "Bash and Linux Subsystem" is out of beta the steps are:

1. install mongoDb on windows, because it does not work properly on the subsystem
2. add windows feature " Windows Subsystem for Linux"
3. go into windows store and install your linux, i.e. search for ubuntu
4. start ubuntu subsystem
5. install nodejs as descripted for ubuntu,
   and so on

[trivalik]

I checked the analytic forex, and found that it at the moment is only build able with Visual Studio 2015. If you would install it, it would build. Anyway I made a pull request with Visual Studio 2017 support to the analytic forex project. Anyway not sure if this will be accepted. If not can you fork it to hold the change?
Here the pull request:
https://github.com/mkmarek/forex.analytics/pull/12