fixing appveyor osx path to bin vs. the former bin_osx
diff --git a/appveyor.yml b/appveyor.yml
index d790c2e..2e08df1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -43,6 +43,6 @@
   # Linux
   - path: bin/basisu
   # MacOS
-  - path: bin_osx/basisu
+  - path: bin/basisu
   # Windows
   - path: bin\$(configuration)\basisu.exe