updated MSpec version in rakefile

Author: chester89

RakeFile

@@ -91,7 +91,7 @@ namespace :specs do
 
   desc 'Run MSpec specs'
   mspec :mspec do |mspec|
-    mspec.command = 'src/packages/Machine.Specifications.0.5.6.0/tools/mspec.exe'
+    mspec.command = 'src/packages/Machine.Specifications.0.5.15.0/tools/mspec.exe'
     mspec.assemblies 'src/FluentNHibernate.Specs/bin/Release/FluentNHibernate.Specs.dll'
   end