More debug info printed when using -v switch (or -vv?)

[kaushalmodi]

Hey, I'm glad this issue is resolved by #76, wasn't expecting that 😄

@orhun May I suggest that when the user uses -v (or may be -vv), you print all the environment variables and parsed git cliff CLI switch values that affect its output?

Hmm, can you elaborate what you mean with an example? Actually, having a separate issue for tracking this would be great.

Originally posted by @orhun in #75 (comment)

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I meant that when -v or -vv switch is used, git-cliff should dump out values of all the environment variables it's going to use, and also the values of all the CLI switches passed by the user.

[orhun]

With a8efffc, arguments and parsed configuration is printed to stdout (as trace log) if -vv is used.

I think this should be enough to debug situations like #75, what do you think?

[kaushalmodi]

This helps! Thank you.