Set Compose file version '3' (for Windows)

Toby McLaughlin · Toby McLaughlin · commit cb46b848ec79 · 2017-06-02T11:23:29.000+10:00
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,5 +1,5 @@
 ---
-version: '3.2'
+version: '3'
 services:
   # The environment variable "TAG" is used throughout this file to
   # specify the version of the images to run. The default is set in the
