bumping version 0.4.0 => 0.4.1

Author: Emanuele Palazzetti

lib/ddtrace/version.rb

@@ -2,7 +2,7 @@ module Datadog
   module VERSION
     MAJOR = 0
     MINOR = 4
-    PATCH = 0
+    PATCH = 1
 
     STRING = [MAJOR, MINOR, PATCH].compact.join('.')
   end