exchanges: remove Coinbene exchange support (#849)

* exchanges: remove Coinbene exchange support

* RM Coinbene from apichecker backup

docs/ADD_NEW_EXCHANGE.md

@@ -209,7 +209,6 @@ Yes means supported, No means not yet implemented and NA means protocol unsuppor
 | Exmo | Yes | NA | NA |
 | FTX | Yes | Yes | No | // <-------- new exchange
 | CoinbasePro | Yes | Yes | No|
-| Coinbene | Yes | No | No |
 | GateIO | Yes | Yes | NA |
 | Gemini | Yes | Yes | No |
 | HitBTC | Yes | Yes | No |
@@ -238,7 +237,6 @@ var Exchanges = []string{
 	"btc markets",
 	"btse",
 	"coinbasepro",
-	"coinbene",
 	"coinut",
 	"exmo",
 	"ftx", // <-------- new exchange

docs/MULTICHAIN_TRANSFER_SUPPORT.md

@@ -53,7 +53,6 @@ $ ./gctcli withdrawcryptofunds --exchange=ftx --currency=USDT --address=TJU9piX2
 | BTCMarkets | No | No| NA  |
 | BTSE | No | No | Only through website |
 | CoinbasePro | No | No | No|
-| Coinbene | Yes | Yes | Addresses must be created via their website first |
 | COINUT | No | No | NA |
 | Exmo | Yes | Yes | Addresses must be created via their website first |
 | FTX | Yes | Yes | |

docs/OHLCV.md

@@ -75,7 +75,6 @@ A helper tool [cmd/dbseed](../cmd/dbseed/README.md) has been created for assisti
 | Bittrex        |             | 
 | BTSE           | Y           |      
 | Coinbase Pro   | Y           |
-| Coinbene       | Y           | 
 | Coinut         |             |         
 | Exmo           |             |
 | GateIO         | Y           |