Drop V1 support in derive (#1718)

* Drop V1 support in derive

* Re-do staking with multi

* Re-bump deps

* Adjusts tests (no alice_session)

* CC

packages/api-derive/src/balances/fees.ts

@@ -13,7 +13,7 @@ import { memo } from '../util';
 
 type Result = [Balance, Balance, Balance, Balance, Balance];
 
-function queryV2 (api: ApiInterfaceRx): Observable<Result> {
+function query (api: ApiInterfaceRx): Observable<Result> {
   const paymentBase = api.consts.transactionPayment || api.consts.balances;
 
   return of([
@@ -27,17 +27,6 @@ function queryV2 (api: ApiInterfaceRx): Observable<Result> {
   ]);
 }
 
-function queryV1 (api: ApiInterfaceRx): Observable<Result> {
-  return api.queryMulti<Result>([
-    // Support older versions and get values from storage
-    api.query.balances.creationFee,
-    api.query.balances.existentialDeposit,
-    api.query.balances.transferFee,
-    api.query.balances.transactionBaseFee,
-    api.query.balances.transactionByteFee
-  ]);
-}
-
 /**
  * @name fees
  * @returns An object containing the combined results of the storage queries for
@@ -52,10 +41,6 @@ function queryV1 (api: ApiInterfaceRx): Observable<Result> {
  * ```
  */
 export function fees (api: ApiInterfaceRx): () => Observable<DerivedFees> {
-  const query = api.consts.balances
-    ? queryV2
-    : queryV1;
-
   return memo((): Observable<DerivedFees> =>
     query(api).pipe(
       map(([creationFee, existentialDeposit, transferFee, transactionBaseFee, transactionByteFee]): DerivedFees => ({