Companion for #7789 (BabeApi::current_epoch) (#2170)

* point to branch

* update babe API implementations

* build

* Revert "point to branch"

This reverts commit 669fde1e58cac1eef1847d5e6b39520fa4953f33.

* update Cargo.lock

* bump

polkadot/runtime/kusama/src/lib.rs

@@ -1235,6 +1235,10 @@ sp_api::impl_runtime_apis! {
 			Babe::current_epoch_start()
 		}
 
+		fn current_epoch() -> babe_primitives::Epoch {
+			Babe::current_epoch()
+		}
+
 		fn generate_key_ownership_proof(
 			_slot_number: babe_primitives::SlotNumber,
 			authority_id: babe_primitives::AuthorityId,

polkadot/runtime/polkadot/src/lib.rs

@@ -1231,6 +1231,10 @@ sp_api::impl_runtime_apis! {
 			Babe::current_epoch_start()
 		}
 
+		fn current_epoch() -> babe_primitives::Epoch {
+			Babe::current_epoch()
+		}
+
 		fn generate_key_ownership_proof(
 			_slot_number: babe_primitives::SlotNumber,
 			authority_id: babe_primitives::AuthorityId,

polkadot/runtime/rococo/src/lib.rs

@@ -809,6 +809,10 @@ sp_api::impl_runtime_apis! {
 			Babe::current_epoch_start()
 		}
 
+		fn current_epoch() -> babe_primitives::Epoch {
+			Babe::current_epoch()
+		}
+
 		fn generate_key_ownership_proof(
 			_slot_number: babe_primitives::SlotNumber,
 			authority_id: babe_primitives::AuthorityId,

polkadot/runtime/test-runtime/src/lib.rs

@@ -741,6 +741,10 @@ sp_api::impl_runtime_apis! {
 			Babe::current_epoch_start()
 		}
 
+		fn current_epoch() -> babe_primitives::Epoch {
+			Babe::current_epoch()
+		}
+
 		fn generate_key_ownership_proof(
 			_slot_number: babe_primitives::SlotNumber,
 			_authority_id: babe_primitives::AuthorityId,

polkadot/runtime/westend/src/lib.rs

@@ -955,6 +955,10 @@ sp_api::impl_runtime_apis! {
 			Babe::current_epoch_start()
 		}
 
+		fn current_epoch() -> babe_primitives::Epoch {
+			Babe::current_epoch()
+		}
+
 		fn generate_key_ownership_proof(
 			_slot_number: babe_primitives::SlotNumber,
 			authority_id: babe_primitives::AuthorityId,