Could a index.md file be treated as default if inside a folder?

[chancesmith]

I've co-located my images with my posts:

posts/

./post-1/
- image.png
- image-2.png
- index.md

Currently, the URL to see the post is site.com/post-1/index.

How can I get the URL to be site.com/post-1?

[chancesmith]

Should I name index.md to something else?