Appveyor: Explain appveyor image names in the comments

Appveyor images are named after the Visual Studio version they contain.
But we compile using MinGW, not Visual Studio.
We use these images because they have different Windows versions.

Closes bug 28826.

diff --git a/.appveyor.yml b/.appveyor.yml
index 837cded43c67b5550cd1afdf191834d9bf6d8675..69cbd8e2d6b00fa1a6ee7578caec73752195f16e 100644 (file)
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -2,6 +2,9 @@ version: 1.0.{build}
 
 clone_depth: 50
 
+# Appveyor images are named after the Visual Studio version they contain.
+# But we compile using MinGW, not Visual Studio.
+# We use these images because they have different Windows versions.
 image:
   # Windows Server 2012 R2
   - Visual Studio 2015