Changed all occurences of referendums to referenda. Updated spec versions. (#2545)

substrate/node-template/runtime/src/lib.rs

@@ -94,8 +94,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node-template"),
 	impl_name: create_runtime_str!("node-template"),
 	authoring_version: 3,
-	spec_version: 3,
-	impl_version: 0,
+	spec_version: 4,
+	impl_version: 4,
 	apis: RUNTIME_API_VERSIONS,
 };