Add `src` folder to the release package
Add `src` folder to the release package

sparhami/incremental-dom,reggi/incremental-dom,markuskobler/incremental-dom,google/incremental-dom,PolymerLabs/incremental-dom,reggi/incremental-dom,jridgewell/incremental-dom,markuskobler/incremental-dom,google/incremental-dom,google/incremental-dom,jridgewell/incremental-dom,sparhami/incremental-dom,PolymerLabs/incremental-dom,paolocaminiti/incremental-dom,sparhami/incremental-dom,Rich-Harris/incremental-dom,paolocaminiti/incremental-dom,sparhami/incremental-dom,PolymerLabs/incremental-dom,Rich-Harris/incremental-dom,jridgewell/incremental-dom