add_subdirectory-test -> add-subdirectory-test for consistency

test/CMakeLists.txt

@@ -137,11 +137,11 @@ if (FMT_PEDANTIC)
                     "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
 
   # test if the targets are findable when add_subdirectory is used
-  add_test(add_subdirectory-test ${CMAKE_CTEST_COMMAND}
+  add_test(add-subdirectory-test ${CMAKE_CTEST_COMMAND}
     -C ${CMAKE_BUILD_TYPE}
     --build-and-test
-    "${CMAKE_CURRENT_SOURCE_DIR}/add_subdirectory-test"
-    "${CMAKE_CURRENT_BINARY_DIR}/add_subdirectory-test"
+    "${CMAKE_CURRENT_SOURCE_DIR}/add-subdirectory-test"
+    "${CMAKE_CURRENT_BINARY_DIR}/add-subdirectory-test"
     --build-generator ${CMAKE_GENERATOR}
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
     --build-options "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")