Merge pull request shotstack#11 from shotstack/latest-updates-jul-2021

July 2021 Feature Update

Merge pull request shotstack#10 from shotstack/disk-settings

Add disk and cache. Update descriptions.

Merge pull request shotstack#9 from shotstack/guzzle-7

Update to Guzzle 7

Merge pull request shotstack#8 from shotstack/output-features-update

Output features, crop and audio asset effects (includes breaking changes)

Merge pull request shotstack#6 from shotstack/slide-carousel-blur-doc…

…s-updates

Add new slide and carousel transitions, blur effect and docs update

Add luma asset and mulitple tweaks

Merge pull request shotstack#3 from shotstack/webhook-callback

Add webhook callback parameter

Fix default coor to use hex insated of word. Copy and spelling updates.

Add Audio asset, fonts and opacity

Add Asset class