Allow failures on installs

Timer · Timer · commit 0551727fee1a · 2018-09-26T00:10:41.000-04:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,6 +1,9 @@
 image: Visual Studio 2017
 
 environment:
+  APPVEYOR_SAVE_CACHE_ON_ERROR: true
+  allow_failures:
+    - test_suite: "installs"
   matrix:
     - nodejs_version: 10
       test_suite: "simple"
