Make all functions in intval async/await

app/lib/intval/index.js

@@ -35,15 +35,17 @@ class Intval {
 		})
 	}
 	async setExposure (exposure, cb) {
+		return new Promise ((resolve, reject) => {
 			const timeStart = +new Date()
 			const url = `${this._baseUrl}/exposure?exposure=${exposure}`
 			//console.log(url)
-		req(url, (err, res, body) => {
+			return req(url, (err, res, body) => {
 				let ms = (+new Date()) - timeStart
 				if (err) {
-				console.error(err)
+					return reject(err)
 				}
-			cb(ms)
+				return resolve(ms)
+			})
 		})
 	}
 	connect (cb) {