make IUserData get default value optional (#144)

Author: JacerOmri

src/definitions.ts

@@ -376,7 +376,7 @@ export interface StoredUser {
 export interface IUserData {
   data: Object;
 
-  get(key: string, defaultValue: any);
+  get(key: string, defaultValue?: any);
   set(key: string, value: any);
   unset(key: string);
 }

src/user/user.ts

@@ -82,7 +82,7 @@ export class UserData implements IUserData {
     }
   }
 
-  public get(key: string, defaultValue: any) {
+  public get(key: string, defaultValue?: any) {
     if (this.data.hasOwnProperty(key)) {
       return this.data[key];
     } else {