Removed deprecated Resource conversion operator.

Use explicit conversion instead.

src/Magnum/Resource.h

@@ -35,10 +35,6 @@
 #include "Magnum/Magnum.h"
 #include "Magnum/visibility.h"
 
-#ifdef MAGNUM_BUILD_DEPRECATED
-#include <Corrade/Utility/Macros.h>
-#endif
-
 namespace Magnum {
 
 /**
@@ -205,16 +201,6 @@ class Resource {
             return *static_cast<U*>(data);
         }
 
-        #ifdef MAGNUM_BUILD_DEPRECATED
-        /**
-         * @overload
-         * @deprecated Use the explicit @ref operator*() or @ref operator->()
-         *      instead. Implicit conversion is no longer allowed if it might
-         *      throw an assertion.
-         */
-        CORRADE_DEPRECATED("use operator*() or operator->() instead") operator U&() { return **this; }
-        #endif
-
         /**
          * @brief Access to resource data
          *