Message is always printed as bold regardless of configuration

[abrindam]

To reproduce, setup your config file colors so that messages should not be printed as bold, for example:

colors:
    timestamp:
        fg: cyan
    message:        
        fg: white
        bold: false
    attributekey:
        faint: true
        fg: green
    attributevalue:
        faint: true
        fg: white

Expected behavior: the message field should not be printed bold
Actual behavior: it is printed bold

Note: The opposite, making other fields bold, works fine.

From a quick look, this appears to be caused by a bug in the underlying "mergo" library that is used to merge the default config and the user's config. Boolean values of false are not merged. See this issue: darccio/mergo#166