v0.2.2 - changed a `1` to a `0` to make the library function again

LazySignal did not work lazily because of a silly typo, where I was supposed to set this.dirty = 0 after updating/recomputing the signal's value, but instead had it set to this.dirty = 1.
Imagine my disappointment.

Zettai Kanashii Hanashii...
mou inochi wa kankei nai.

Full Changelog: v0.2.1...v0.2.2