switching to eslint for code checking

most rules degraded to WARN, so we don't go insane. This will
change over time. The aim is to conform to a common style

Signed-off-by: Claudius Coenen <opensource@amenthes.de>

public/js/history.js

@@ -218,6 +218,7 @@ export function getStorageHistory (callback) {
     if (typeof data === 'string') { data = JSON.parse(data) }
     callback(data)
   }
+  // eslint-disable-next-line standard/no-callback-literal
   callback([])
 }