This commit updates the colorschemes and adds some new ones: * gotham (https://github.com/novln/micro-gotham-colors) * monokai-dark (https://github.com/Theodus/micro-monokai-dark) * one-dark (https://github.com/joseluisq/micro-one-dark) * sunny-day (https://github.com/dwwmmn/micro-sunny-day)