Refactor: change to switch statement

[helenzhou6]

Weather-to-wear/src/utilities/genClothingMsg.js

Lines 2 to 10 in aaa0647

	if (lowestTemp < 5 && highestTemp < 10) {
	return "a thick jumper";
	} else if (lowestTemp > 20 && highestTemp > 20) {
	return "shorts";
	} else if (lowestTemp < 20 && highestTemp > 20) {
	return "shorts and a jumper";
	} else {
	return "something not too thin and not too thick";
	}

Weather-to-wear/src/utilities/genCoatMsg.js

Lines 2 to 8 in aaa0647

	if (precipProbability < 20) {
	return `take your chances and don't bring a ${precipType} jacket!`;
	} else if (precipProbability > 70) {
	return `put on your ${precipType} jacket!`;
	} else {
	return `carry your ${precipType} jacket (or get your chances - ${100 - precipProbability}% chance of being fine!`;
	}