Update README.md (pandas-dev#536)

bmoscon · web-flow · commit 90e2b867e62b · 2018-04-20T07:40:33.000-04:00
diff --git a/README.md b/README.md
@@ -119,6 +119,7 @@ Arctic currently works with:
 Operating Systems:
  * Linux
  * macOS
+ * Windows 10
 
 ## Acknowledgements
 
