v0.6.1: some refactoring and added CLI options test.

No functional changes.

V0.6: proper CSV output support

We can now output the data in CSV format to stdout (or a file with -o of course). Code has been reorganized as well.

v0.5.1 minor release to fix README.

Welcome v0.5.1 with fixed README for crates publish.

v0.5: usable version with json/txt output

This release is almost complete, only thing missing is CSV output. Right it displays plain text or JSON, either on standard output or in a give file (when using -o OUTPUT).