Set PATH in Appveyor

appveyor.yml

@@ -13,7 +13,10 @@ install:
   # Check current supported Windows images here:
   # https://www.appveyor.com/docs/windows-images-software/#ruby
   - SET CUSTOM_RUBY_VERSION=2.5.1
-  # - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
+  # If there are `Unable to download data from https://rubygems.org/` issues,
+  # then add the current Appveyor Ruby version to the path.
+  # https://help.appveyor.com/discussions/problems/15052-unable-to-download-data-from-httpsrubygemsorg
+  - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
   - ruby -e "puts RUBY_PLATFORM"
   # Get around the error
   # `OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: certificate verify failed`
@@ -29,7 +32,7 @@ install:
   - gem update --system
   - gem install i18n rspec
   # Cache gems: https://www.appveyor.com/docs/lang/ruby/#caching
-  - bundle config --local path vendor/bundle
+  # - bundle config --local path vendor/bundle
   - bundle install
 before_test:
   - ruby -v