Upgrade Crystal to 1.2.1 and Lucky to 0.29.0

spec/setup/configure_lucky_flow.cr

@@ -1,5 +1,13 @@
+# For more detailed documentation, visit
+# https://luckyframework.org/guides/testing/html-and-interactivity
+
 LuckyFlow.configure do |settings|
   settings.stop_retrying_after = 200.milliseconds
   settings.base_uri = Lucky::RouteHelper.settings.base_uri
+
+  # By default, LuckyFlow is set in "headless" mode (no browser window shown).
+  # Uncomment this to enable running `LuckyFlow` in a Google Chrome window instead.
+  # Be sure to disable for CI.
+  # settings.driver = LuckyFlow::Drivers::Chrome
 end
 Spec.before_each { LuckyFlow::Server::INSTANCE.reset }