Update appveyor script to recommended form

Author: musm

appveyor.yml

@@ -1,18 +1,18 @@
 environment:
   matrix:
   - julia_version: 0.7
-  - julia_version: 1.0
-  - julia_version: latest
+  - julia_version: 1
+  - julia_version: nightly
 
 platform:
   - x86 # 32-bit
   - x64 # 64-bit
 
-## uncomment the following lines to allow failures on nightly julia
-## (tests will run but not make your overall status red)
+# Uncomment the following lines to allow failures on nightly julia
+# (tests will run but not make your overall status red)
 matrix:
   allow_failures:
-  - julia_version: latest
+  - julia_version: nightly
 
 branches:
   only:
@@ -34,4 +34,10 @@ build_script:
 
 test_script:
   - echo "%JL_TEST_SCRIPT%"
-  - C:\julia\bin\julia -e "%JL_TEST_SCRIPT%"
+  - C:\julia\bin\julia -e "%JL_TEST_SCRIPT%"
+
+# # Uncomment to support code coverage upload. Should only be enabled for packages
+# # which would have coverage gaps without running on Windows
+# on_success:
+#   - echo "%JL_CODECOV_SCRIPT%"
+#   - C:\julia\bin\julia -e "%JL_CODECOV_SCRIPT%"