fix(types): resolve use func not allowing to mix middlewares

[michaeleliot]

Currently the use function allows for inputs to be either Middleware or ErrorHandlingMiddleware. However, the typescript type requires the list of arguments to be only Middleware or only ErrorHandlingMiddleware. I.e. you couldn't call api.use with both error middleware and normal middleware. This pr brings the typescript type back into line with code expectation.

Code Section in question:

lambda-api/index.js

Lines 355 to 383 in c1fe83e

	use(...args) {
	// Extract routes
	let routes = typeof args[0] === 'string' ? Array.of(args.shift()) : (Array.isArray(args[0]) ? args.shift() : ['/*'])
	// Init middleware stack
	let middleware = []
	// Add func args as middleware
	for (let arg in args) {
	if (typeof args[arg] === 'function') {
	if (args[arg].length === 3) {
	middleware.push(args[arg])
	} else if (args[arg].length === 4) {
	this._errors.push(args[arg])
	} else {
	throw new ConfigurationError('Middleware must have 3 or 4 parameters')
	}
	}
	}
	// Add middleware to path
	if (middleware.length > 0) {
	routes.forEach(route => {
	this.METHOD('__MW__',route,...middleware)
	})
	}
	} // end use

[naorpeled]

Hey @michaeleliot,
thanks for your contribution, you're awesome 😎