Fix pass no-color and verbose flags to crystal build (#517)

Co-authored-by: Sijawusz Pur Rahnama <sija@sija.pl>

src/commands/build.cr

@@ -34,6 +34,12 @@ module Shards
           "-o", File.join(Shards.bin_path, target.name),
           target.main,
         ]
+        unless Shards.colors?
+          args << "--no-color"
+        end
+        if Shards::Log.level <= ::Log::Severity::Debug
+          args << "--verbose"
+        end
         options.each { |option| args << option }
         Log.debug { "crystal #{args.join(' ')}" }
 

src/logger.cr

@@ -2,11 +2,7 @@ require "colorize"
 require "log"
 
 module Shards
-  @@colors = true
-
-  def self.colors=(value)
-    @@colors = value
-  end
+  class_property? colors = true
 end
 
 Log.setup_from_env(