Colorama dependency not mentioned or handled

Hey folks, when installing on Windows I ran into the issue of `colorama` module not found. Could that be added to the requirements section? `pip install colorama` was sufficient to resolve the issue.

https://github.com/aws/aws-elastic-beanstalk-cli-setup/blob/6b2d6646c728e9ccfc6bb482926bb6ba5451c322/scripts/ebcli_installer.py#L355

Start at scripts/ebcli_installer.py around line 355 and inspect how the installer declares or installs Python requirements. Add colorama to the requirements section and verify that a Windows installation no longer reports the module missing.

Written by the indexing model from the issue text.