Use =default for special methods

Author: mikee47

src/include/FlashString/ObjectIterator.hpp

@@ -45,9 +45,7 @@ template <class ObjectType, typename ElementType> class ObjectIterator
 	{
 	}
 
-	~ObjectIterator()
-	{
-	}
+	~ObjectIterator() = default;
 
 	ObjectIterator& operator++()
 	{

src/include/FlashString/StringPrinter.hpp

@@ -43,9 +43,7 @@ class StringPrinter
 	StringPrinter& operator=(const StringPrinter&) = delete;
 	StringPrinter& operator=(StringPrinter&&) = delete;
 
-	~StringPrinter()
-	{
-	}
+	~StringPrinter() = default;
 
 	size_t printTo(Print& p) const;