book_offers returns offers type OfferLedgerEntry (#951)

* rippled-api function book_offers returns offers in the format of OfferLedgerEntry not OfferCreateTransaction
* updated type of account_objects

src/common/types/commands/account_objects.ts

@@ -1,4 +1,9 @@
-import {CheckLedgerEntry} from '../objects'
+import {
+  CheckLedgerEntry, RippleStateLedgerEntry,
+  OfferLedgerEntry, SignerListLedgerEntry,
+  EscrowLedgerEntry, PayChannelLedgerEntry,
+  DepositPreauthLedgerEntry
+} from '../objects'
 
 export interface GetAccountObjectsOptions {
   type?: string | (
@@ -44,7 +49,16 @@ export interface AccountObjectsResponse {
   account: string,
 
   // Array of objects owned by this account.
-  account_objects: CheckLedgerEntry | object,
+  // from the getAccountObjects section of the dev center
+  account_objects: Array<
+    CheckLedgerEntry |
+    RippleStateLedgerEntry |
+    OfferLedgerEntry |
+    SignerListLedgerEntry |
+    EscrowLedgerEntry |
+    PayChannelLedgerEntry |
+    DepositPreauthLedgerEntry
+  >,
 
   // (May be omitted) The identifying hash of the ledger
   // that was used to generate this response.

src/common/types/commands/book_offers.ts

@@ -1,7 +1,7 @@
 import {
   TakerRequestAmount,
   RippledAmount,
-  OfferCreateTransaction
+  OfferLedgerEntry
 } from '../objects'
 
 export interface BookOffersRequest {
@@ -22,7 +22,7 @@ export interface BookOffersResponse {
   marker?: any
 }
 
-export interface BookOffer extends OfferCreateTransaction {
+export interface BookOffer extends OfferLedgerEntry {
   quality?: string
   owner_funds?: string,
   taker_gets_funded?: RippledAmount,