Update appveyor.yml

appveyor.yml

@@ -21,15 +21,17 @@ environment:
 build_script:
 - cmd: >-
     set
-
+    
     mkdir build
-
-    cd build
+    
+    cd build 
 
     set PATH=%PATH%:C:\Program Files\Git\usr\bin
 
     set PATH=C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\bin;C:\msys64\bin;%PATH%
     
+    mingw-get install g++
+    
     cmake .. -G %GENERATOR% -DCMAKE_BUILD_TYPE=%BUILD_TYPE% -DSPDLOG_WCHAR_SUPPORT=ON -DSPDLOG_BUILD_EXAMPLE=ON -DSPDLOG_BUILD_EXAMPLE_HO=ON -DSPDLOG_BUILD_TESTS=ON -DSPDLOG_BUILD_TESTS_HO=OFF
 
     cmake --build . --config %BUILD_TYPE%