Allow for disabling the shutdown message (#292)

Allow for disabling the shutdown message

spec/config_spec.cr

@@ -29,6 +29,14 @@ describe "Config" do
     config.handlers.size.should eq(6)
   end
 
+  it "toggles the shutdown message" do
+    config = Kemal.config
+    config.shutdown_message = false
+    config.shutdown_message.should eq false
+    config.shutdown_message = true
+    config.shutdown_message.should eq true
+  end
+
   it "adds custom options" do
     config = Kemal.config
     ARGV.push("--test")

src/kemal.cr

@@ -41,7 +41,7 @@ module Kemal
     # Test environment doesn't need to have signal trap, built-in images, and logging.
     unless config.env == "test"
       Signal::INT.trap {
-        log "Kemal is going to take a rest!\n"
+        log "Kemal is going to take a rest!\n" if config.shutdown_message
         Kemal.stop
         exit
       }

src/kemal/config.cr

@@ -15,7 +15,8 @@ module Kemal
     {% end %}
 
     property host_binding, ssl, port, env, public_folder, logging, running,
-      always_rescue, serve_static : (Bool | Hash(String, Bool)), server, extra_options
+      always_rescue, serve_static : (Bool | Hash(String, Bool)), server, extra_options,
+      shutdown_message
 
     def initialize
       @host_binding = "0.0.0.0"
@@ -32,6 +33,7 @@ module Kemal
       @custom_handler_position = 4
       @default_handlers_setup = false
       @running = false
+      @shutdown_message = true
     end
 
     def logger