💚 fix AppVeyor and Travis builds

appveyor.yml

@@ -123,4 +123,4 @@ test_script:
   # as it is extremely slow to run and cause
   # occasional timeouts on AppVeyor.
   # More info: https://github.com/nlohmann/json/pull/1570
-  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode_all" -C "%configuration%" -V -j
+  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode" -C "%configuration%" -V -j

test/CMakeLists.txt

@@ -162,7 +162,7 @@ foreach(file ${files})
 
     if(JSON_Valgrind)
         add_test(NAME "${testcase}_valgrind"
-            COMMAND ${memcheck_command} ${CMAKE_CURRENT_BINARY_DIR}/${testcase} ${DOCTEST_TEST_FILTER} --no-skip
+            COMMAND ${memcheck_command} ${CMAKE_CURRENT_BINARY_DIR}/${testcase} ${DOCTEST_TEST_FILTER}
             WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
         )
         set_tests_properties("${testcase}_valgrind" PROPERTIES LABELS "valgrind")