support usage with typescript

[samanpwbb]

Right now underreact mostly works fine with typescript, but we could improve compatibility. At a minimum, the SVG loader needs to include .ts and .tsx file type support:

underreact/lib/webpack-config/loaders-list.js

Lines 45 to 56 in 4c531a9

	const svgLoader = {
	test: /\.svg$/,
	// Applies react transformation only to svgs imported
	// from Javascript files
	issuer: /\.(js|jsx)$/,
	use: {
	loader: '@mapbox/svg-react-transformer-loader',
	options: {
	template: 'fancy'
	}
	}
	};