This is a small bugfix release:

• #38 was fixed. In some cases, use of MutationObserver was not reloading images in some SPA scenarios.
• An unlogged bug was discovered where Safari would download unnecessary assets because yall was setting src attributes before srcset attributes, causing Safari to get the src-referenced resource first. This could be side-stepped by specifying an attribute order of data-srcset first, then data-src. yall's data- attribute flipping function was refactored to fix this.
• Slightly smaller build size.