Jonathan Zarra knew something about Pokémon Go that most people didnât. As a beta tester this summer, the 28-year-old freelance developer had early access to the smash hit mobile game â and as a result, he could see that it offered users no way to chat with one another inside the app. And so Zarra built GoChat, an independent app that lets Pokémon Go users leave notes for each other at in-game locations....
