Update Installfest to include instructions for upgrading Ruby in Windows

[scottschup]

Heroku now only supports MRI versions 2.4.5, 2.5.3, and 2.6.1 but RailsInstaller only comes with 2.2.6 or 2.3.3.

In order for Windows users to deploy to Heroku, after running RailsInstaller, users will need to remove the Ruby version it came with and install one of the Heroku-compatible versions via RubyInstaller.

Instructions to do so need to be added to the Installfest docs.

[stephan-dev]

Heroku now only supports MRI versions 2.4.5, 2.5.3, and 2.6.1 but RailsInstaller only comes with 2.2.6 or 2.3.3.

source for that?

[wassimk]

Looks like someone updated the instructions to 2.5.3 but the links don't have such a download. Our last two workshops have used these alternate Windows OS instructions.

http://bit.ly/installfest-windows