Fail on service exceptions, i.e. HTTP 5xx errors

Before, the lane would have just swallowed this error. It would have printed it, but still treated the call as a success.
Now, it will fail execution on a service error, i.e. when this is caused by a service outage, to signal the lane did not succeed.

lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb

@@ -48,6 +48,8 @@ module Fastlane
         when 404
           UI.error("Not found, invalid owner or application name")
           false
+        when 500..
+          UI.crash!("Internal Service Error, please try again later")
         else
           UI.error("Error #{response.status}: #{response.body}")
           false

spec/appcenter_upload_spec.rb

@@ -275,6 +275,24 @@ describe Fastlane::Actions::AppcenterUploadAction do
       end.to raise_error("No or incorrect destination type given. Use 'group' or 'store'")
     end
 
+    it "handles external service response and fails" do
+      expect do
+        stub_check_app(200)
+        stub_create_release_upload(500)
+        
+        Fastlane::FastFile.new.parse("lane :test do
+          appcenter_upload({
+            api_token: 'xxx',
+            owner_name: 'owner',
+            app_name: 'app',
+            apk: './spec/fixtures/appfiles/apk_file_empty.apk',
+            destinations: 'Testers',
+            destination_type: 'group'
+          })
+        end").runner.execute(:test)
+      end.to raise_error("Internal Service Error, please try again later")
+    end
+
     it "handles upload build error" do
       stub_check_app(200)
       stub_create_release_upload(200)