Feature Request: use globbing for --input

[SetTrend]

For my local repositories I'm using the GitHub standard of writing my ReadMe.md file to the root of the repository.

Currently, when I write generate-md --input . --output .html --layout github, all my repository files are copied to the .html folder.

Please add a globbing feature to the --input parameter. So users would be able to write:

generate-md --input .\*.md --output .html --layout github

- or -

generate-md --input ./content/**/*.md --output .html --layout github