Checking for non-Markdown files.
Checking for non-Markdown files.

Closes #55.

easyreporting/fmri_reporting,easyreporting/fmri_reporting,dleehr/organization-RR-Jupyter,butterflyology/rr-intro,dleehr/organization-RR-Jupyter,Reproducible-Science-Curriculum/rr-literate-programming,dleehr/organization-RR-Jupyter,butterflyology/rr-intro,Reproducible-Science-Curriculum/rr-literate-programming,easyreporting/fmri_reporting,easyreporting/fmri_reporting,butterflyology/rr-intro,dleehr/organization-RR-Jupyter,butterflyology/rr-intro,Reproducible-Science-Curriculum/rr-automation,easyreporting/fmri_reporting,dleehr/organization-RR-Jupyter,easyreporting/fmri_reporting,butterflyology/rr-intro,butterflyology/rr-intro,Reproducible-Science-Curriculum/rr-automation,dleehr/organization-RR-Jupyter