added operator overload for string

include/godot_cpp/Godot.hpp

@@ -173,7 +173,7 @@ struct _WrappedMethod1<T, void, A0> {
 		(obj->*(method->f))(*arg[0]);
 
 		return v;
-	}
+ 	}
 };
 
 

include/godot_cpp/core/String.cpp

@@ -66,6 +66,11 @@ int String::length() const
 	return len;
 }
 
+void String::operator =(const String &s)
+{
+	godot_string_copy_string(&_godot_string, &s._godot_string);
+}
+
 bool String::operator ==(const String &s)
 {
 	return godot_string_operator_equal(&_godot_string, &s._godot_string);

include/godot_cpp/core/String.hpp

@@ -41,6 +41,8 @@ public:
 
 	int length() const;
 
+	void operator =(const String &s);
+
 	bool operator ==(const String &s);
 
 	bool operator !=(const String &s);