Remove redundant include (#479)

fmt/format.h

@@ -38,7 +38,7 @@
 #include <stdexcept>
 #include <string>
 #include <vector>
-#include <utility>
+#include <utility>  // for std::pair
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
 #define FMT_VERSION 30002
@@ -155,10 +155,6 @@ typedef __int64          intmax_t;
 # endif
 #endif
 
-#if FMT_USE_RVALUE_REFERENCES
-# include <utility>  // for std::move
-#endif
-
 // Check if exceptions are disabled.
 #if defined(__GNUC__) && !defined(__EXCEPTIONS)
 # define FMT_EXCEPTIONS 0