CLI: Margins option not processed

[Niremizov]

Describe the bug -M --margins options is not processed when using CLI.

Steps to reproduce the bug

1. Example CLI command:

camelot --split_text --margins 1.5 0.5 0.8 --format html --output /tmp/1453949390-0823722001717578612/extract.txt --pages all stream -e 500 -r 8 [filePath]

Result: Margins not processed and not passed to read_pdf() function.

Expected behavior

Margins options would be passed to read_pdf() layout_kwargs - argument.

Environment

• OS: Ubuntu
• Python version: 3.8
• Camelot version: 0.11.0