Fixing the behavior on how filepath for saving a file: random and safe prefix with now correct ending, the filepath ending (e.g. ".png") was missing previously.

Small fix for public url of put function return value.

Full Changelog: v0.1.2...v0.1.7

Small bugfix for better error handling on NotFound Error.

For Example: You are previously calling the exists function and getting a NotFound Error. Now it should just return a false instead.

First stable version as documented in README.