Removed abstract flag from class

ref #56

src/models/entities/StatsClient.ts

@@ -5,7 +5,7 @@ import { Column, Entity, PrimaryGeneratedColumn } from "typeorm";
  * StatsClients can be used to access the protected parts of the stats api (top runners, donators and so on).
 */
 @Entity()
-export abstract class StatsClient {
+export class StatsClient {
     /**
      * Autogenerated unique id (primary key).
      */