Make constructQuery typesafe

[BenFradet]

We can make

scala-weather/src/main/scala/com.snowplowanalytics/weather/providers/openweather/Requests.scala

Lines 32 to 38 in 7a40a9e

	def constructQuery(appId: String): String = {
	val end = endpoint.map(e => s"$e/$resource").getOrElse(s"$resource")
	val params = parameters ++ Map("appid" -> appId)
	val queryString = params.map { case (a, b) => s"$a=$b" }.mkString("&")
	s"/data/2.5/$end?$queryString"
	}
	}

typesafe by leveraging hammock's Uri