feat: migrate subdomain shortcuts (#752) (#770)

Also mark as deprecated.

lib/rest/Accounts.ts

@@ -0,0 +1,33 @@
+import {AuthTokenPromotionListInstance} from './accounts/v1/authTokenPromotion';
+import {CredentialListInstance} from './accounts/v1/credential';
+import {SecondaryAuthTokenListInstance} from './accounts/v1/secondaryAuthToken';
+import AccountsBase from './AccountsBase';
+
+export default class Accounts extends AccountsBase {
+    /**
+     * @deprecated - Use v1.authTokenPromotion; instead
+     */
+    get authTokenPromotion(): AuthTokenPromotionListInstance {
+        console.warn('authTokenPromotion is deprecated. Use v1.authTokenPromotion; instead.');
+        return this.v1.authTokenPromotion;
+
+    }
+
+    /**
+     * @deprecated - Use v1.credentials; instead
+     */
+    get credentials(): CredentialListInstance {
+        console.warn('credentials is deprecated. Use v1.credentials; instead.');
+        return this.v1.credentials;
+
+    }
+
+    /**
+     * @deprecated - Use v1.secondaryAuthToken; instead
+     */
+    get secondaryAuthToken(): SecondaryAuthTokenListInstance {
+        console.warn('secondaryAuthToken is deprecated. Use v1.secondaryAuthToken; instead.');
+        return this.v1.secondaryAuthToken;
+
+    }
+}