update supported software

Author: Almenon

appveyor.yml

@@ -10,11 +10,15 @@ image:
 
 environment:
   matrix:
-    - nodejs_version: "10"
-      PYTHON: "C:\\Python36-x64"
 
     - nodejs_version: "12"
-      PYTHON: "C:\\Python36-x64"
+      PYTHON: "C:\\Python37-x64"
+
+    - nodejs_version: "14"
+      PYTHON: "C:\\Python37-x64"
+
+    - nodejs_version: "16"
+      PYTHON: "C:\\Python37-x64"
 
 install:
   - cmd: powershell Install-Product node $env:nodejs_version