rename on_options -> extra_options

spec/config_spec.cr

@@ -35,7 +35,7 @@ describe "Config" do
     ARGV.push("FOOBAR")
     $test_option = nil
 
-    config.on_options = ->(parser : OptionParser) {
+    config.extra_options = ->(parser : OptionParser) {
       parser.on("--test TEST_OPTION", "Test an option") do |opt|
         $test_option = opt
       end

src/kemal/cli.cr

@@ -35,8 +35,8 @@ module Kemal
           puts opts
           exit 0
         end
-        unless @config.on_options.nil?
-          c = @config.on_options.not_nil!
+        unless @config.extra_options.nil?
+          c = @config.extra_options.not_nil!
           c.call opts
         end
       end

src/kemal/config.cr

@@ -3,7 +3,7 @@ module Kemal
     INSTANCE = Config.new
     HANDLERS = [] of HTTP::Handler
     property host_binding, ssl, port, env, public_folder, logging,
-      always_rescue, error_handler, serve_static, run, on_options
+      always_rescue, error_handler, serve_static, run, extra_options
 
     def initialize
       @host_binding = "0.0.0.0"
@@ -16,7 +16,7 @@ module Kemal
       @always_rescue = true
       @error_handler = nil
       @run = false
-      @on_options = nil
+      @extra_options = nil
     end
 
     def logger