Add artifacts section to Appveyor config.

Ensure that a nupkg artifact is created for the build.

Author: bgrainger

appveyor.yml

@@ -13,11 +13,12 @@ notifications:
 - provider: Slack
   incoming_webhook:
     secure: SRJ5fYQE4tvelyqeX3Lkv0gXta3O2pl4/+wNaqmqmcFkmYBe+U31T5YCGhipBOVhHBIZLevihOJZ78sFVJrmAFV5bHgtX/VPIKEXN+7ytis=
+artifacts:
+- path: src\MySqlConnector\bin\Release\MySqlConnector.*.nupkg
 deploy:
-  - provider: NuGet
-    api_key:
-      secure: fLUem5pVBjrrXi52uwp796QP2j5enZsTv36p4dGtW1OOSxWcQYFdb2Z4IZaaHPQZ
-    artifact: src\MySqlConnector\bin\Release\*.nupkg
-    skip_symbols: true
-    on:
-      appveyor_repo_tag: true
+- provider: NuGet
+  api_key:
+    secure: fLUem5pVBjrrXi52uwp796QP2j5enZsTv36p4dGtW1OOSxWcQYFdb2Z4IZaaHPQZ
+  skip_symbols: true
+  on:
+    appveyor_repo_tag: true