ref[raven-js]: TypeScript - use unknown to represent error (#1874)

Author: OliverJAsh

packages/raven-js/typescript/raven.d.ts

@@ -202,7 +202,7 @@ declare namespace Raven {
      * @return {Raven}
      */
     captureException(
-      ex: Error | ErrorEvent | string,
+      ex: unknown,
       options?: RavenOptions
     ): RavenStatic;