relay: unused interface

code/espurna/relay.cpp

@@ -1184,9 +1184,6 @@ String _relay_payload_toggle;
 
 RelayProviderBase::~RelayProviderBase() = default;
 
-void RelayProviderBase::dump() {
-}
-
 bool RelayProviderBase::setup() {
     return true;
 }

code/espurna/relay.h

@@ -66,8 +66,6 @@ public:
     RelayProviderBase() = default;
     virtual ~RelayProviderBase();
 
-    virtual void dump();
-
     // whether the provider is ready
     virtual bool setup();