Update Imageflow to 1.7.3 & other dependencies

v0.6.7

Add rider files

v0.6.6 - Imageflow 1.7.1 brings full rounded corners support

&s.roundcorners=[top-left-radius-percent],[top-right-radius],[bottom-right-radius],[bottom-left-radius] now works, and supports anti-aliasing.

Although, most likely, you just use &s.roundcorners=radius-percentage. Values are 0..100 for each radius percentage. Imageflow 1.7.1 brings anti-aliasing to rounded corners support.

v0.6.5 - Upgrade to Imageflow 1.7.0

This release brings new stability and performance improvements with Imageflow 1.7.0, which now utilizes the latest version of each codec.

v0.6.4

Update README.md

v0.6.3

Update nuget key... again

v0.6.2

Update nuget publish key again

v0.6.1

Update nuget publish key

v0.6.0 - Small breaking change to S3 configuration API

Merge pull request #48 from edmacdonald/s3-client-singleton

move s3client creation outside imageflow server code

v0.5.10 - Handle corrupted jpegs without crashing process

Uses https://github.com/imazen/imageflow/releases/tag/v1.5.8-rc62 and https://github.com/imazen/imageflow-dotnet/releases/tag/v0.7.24

v0.5.9 - Fix watermarks over PNGs, fix 32-bit mode, optimize 24-bit png and webp file sizes

• Fix P/Invoke problem in 32-bit mode (x86)
• Optimize PNG and WebP filesize when converting from WebP by decoding without alpha when appropriate
• Fix compositing when the canvas is a decoded PNG (Fixes imazen/imageflow#580)