ItBit: Remove exchange implementation (#1463)

docs/ADD_NEW_EXCHANGE.md

@@ -213,7 +213,6 @@ Yes means supported, No means not yet implemented and NA means protocol unsuppor
 | Gemini | Yes | Yes | No |
 | HitBTC | Yes | Yes | No |
 | Huobi.Pro | Yes | Yes | NA |
-| ItBit | Yes | NA | No |
 | Kraken | Yes | Yes | NA |
 | Kucoin | Yes | Yes | No |
 | Lbank | Yes | No | NA |
@@ -243,7 +242,6 @@ var Exchanges = []string{
 	"gemini",
 	"hitbtc",
 	"huobi",
-	"itbit",
 	"kraken",
 	"kucoin",
 	"lbank",

docs/MULTICHAIN_TRANSFER_SUPPORT.md

@@ -60,7 +60,6 @@ $ ./gctcli withdrawcryptofunds --exchange=binance --currency=USDT --address=TJU9
 | Gemini | No | No | |
 | HitBTC | No | No | |
 | Huobi.Pro | Yes | Yes | |
-| ItBit | No | No | |
 | Kraken | Yes | Yes | Front-end and API don't match total available transfer chains |
 | Kucoin |  Yes | Yes | |
 | Lbank | No | No | |

docs/OHLCV.md

@@ -81,8 +81,7 @@ A helper tool [cmd/dbseed](../cmd/dbseed/README.md) has been created for assisti
 | GateIO         | Y           |
 | Gemini         |             |
 | HitBTC         | Y           |     
-| Huobi          | Y           |      
-| itBIT          |             |          
+| Huobi          | Y           |              
 | Kraken         | Y           |
 | Kucoin         | Y           |                 
 | lBank          | Y           |