Remove unnecessary type annotations

src/kemal/cli.cr

@@ -3,8 +3,6 @@ require "option_parser"
 module Kemal
   # Handles all the initialization from the command line.
   class CLI
-    @config : Kemal::Config
-    @key_file : String
 
     def initialize
       @ssl_enabled = false

src/kemal/config.cr

@@ -19,7 +19,6 @@ module Kemal
       @logger = nil
       @error_handler = nil
       @always_rescue = true
-      @run = false
     end
 
     def logger