tidy: modernize-use-equals-default

src/streams.h

@@ -161,7 +161,7 @@ public:
     typedef vector_type::const_iterator   const_iterator;
     typedef vector_type::reverse_iterator reverse_iterator;
 
-    explicit DataStream() {}
+    explicit DataStream() = default;
     explicit DataStream(Span<const uint8_t> sp) : DataStream{AsBytes(sp)} {}
     explicit DataStream(Span<const value_type> sp) : vch(sp.data(), sp.data() + sp.size()) {}