* Bittrex GetDepositHistory method return new DepositHistory struct type
* Id field of DepositHistory type changed to int64
* check exchange (exist and enabled) before calling methods on, to avoid program crashes
* Update bittrex_types.go
* t2
* Program always uses the DefaultSyncerTimeout because c.SyncTimeout in engine/syncer.go newer set in code
* gofmt file
Co-authored-by: Ryan O'Hara-Reid <oharareid.ryan@gmail.com>