Bump Interface version

Author: cedelavergne-ledger

src/eth_plugin_interface.h

@@ -26,7 +26,8 @@ typedef enum eth_plugin_interface_version_e {
     ETH_PLUGIN_INTERFACE_VERSION_3 = 3,
     ETH_PLUGIN_INTERFACE_VERSION_4 = 4,
     ETH_PLUGIN_INTERFACE_VERSION_5 = 5,
-    ETH_PLUGIN_INTERFACE_VERSION_LATEST = 6,
+    ETH_PLUGIN_INTERFACE_VERSION_6 = 6,
+    ETH_PLUGIN_INTERFACE_VERSION_LATEST = 7,
 } eth_plugin_interface_version_t;
 
 // Codes for the different requests Ethereum can send to the plugin