The creators of the Epic! app, a digital library service for kids, raised $8 million in a Series C round of funding led by Reach Capital, the education-specialized venture firm. Epic! plans to use the funds to expedite its growth, add to its team, and build out its platform for home and school subscribers. In the future, Kevin Donahue, co-founder of Epic!, even hopes to add virtual and augmented reality content to the app.