mruby: 2.1.0 -> 2.1.1

pkgs/development/compilers/mruby/default.nix

@@ -1,17 +1,17 @@
-{ stdenv, ruby, bison, fetchFromGitHub }:
+{ stdenv, ruby, bison, rake, fetchFromGitHub }:
 
 stdenv.mkDerivation rec {
   pname = "mruby";
-  version = "2.1.0";
+  version = "2.1.1";
 
   src = fetchFromGitHub {
     owner   = "mruby";
     repo    = "mruby";
     rev     = version;
-    sha256  = "1y072c7dh9jf8xwy7kia6cb4dkpspq4zf24ssn7zm5f46p4waxni";
+    sha256  = "gEEb0Vn/G+dNgeY6r0VP8bMSPrEOf5s+0GoOcnIPtEU=";
   };
 
-  nativeBuildInputs = [ ruby bison ];
+  nativeBuildInputs = [ ruby bison rake ];
 
   patches = [ ./bison-36-compat.patch ];