Option for Removing Verbose Chromatic Number Output

[AlexDuchnowski]

Thanks so much for making this library, it's very useful!

At the moment, calling grinpy.chromatic_number results in a lot of output, starting with

Welcome to the CBC MILP Solver 
Version: 2.10.3
Build Date: Dec 15 2019

followed by a command with the flag -printingOptions all. The solving process is then logged in detail with many lines of output. Is there any way to change this behavior? It would be great if there were an optional argument in grinpy.chromatic_number that allowed for silencing these prints entirely (including the welcome message).

(this StackOverflow post seems potentially relevant)