attempt to force color

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

bin/steps/pipenv

 #!/usr/bin/env bash
 
+export CLINT_FORCE_COLOR=1
+
 # Pipenv support (Generate requriements.txt with pipenv).
 if [[ -f Pipfile ]]; then
     if [[ ! -f requirements.txt ]]; then