Use strict equality checking

Remove usage of == and != in favour of === and !==.

test/integration/index.js

@@ -50,7 +50,7 @@ async function get(path) {
 		url: `https://localhost:4443${path}`,
 		core: { rejectUnauthorized: false },
 	});
-	if (res.statusCode != 200) {
+	if (res.statusCode !== 200) {
 		throw new Error(`Got response code ${res.statusCode}, content: ${res.body}`);
 	}
 	return res;

test/integration/server.js

@@ -204,7 +204,7 @@ describe("Integration of lib/factorio/server", function() {
 		describe(".start() termination detection", function() {
 			it("should tell if Factorio got killed", async function() {
 				// This does not work on Windows
-				if (process.platform == "win32") {
+				if (process.platform === "win32") {
 					this.skip();
 				}
 				slowTest(this);