Fix typo in StoreWatchMixin docs
Fix typo in StoreWatchMixin docs

Fixes #35

vsakaria/fluxxor,nagyistoce/fluxxor,andrewslater/fluxxor,chimpinano/fluxxor,hoanglamhuynh/fluxxor,VincentHoang/fluxxor,thomasboyt/fluxxor,demiazz/fluxxor,davesag/fluxxor,dantman/fluxxor,nagyistoce/fluxxor,nagyistoce/fluxxor,BinaryMuse/fluxxor,chimpinano/fluxxor,dantman/fluxxor,VincentHoang/fluxxor,alcedo/fluxxor,davesag/fluxxor,STRML/fluxxor,STRML/fluxxor,hoanglamhuynh/fluxxor,dantman/fluxxor,davesag/fluxxor,SqREL/fluxxor,webcoding/fluxxor,chimpinano/fluxxor,hoanglamhuynh/fluxxor