Rakefile in pdfkit-0.3.1 vs Rakefile in pdfkit-0.3.2

@@ -10,9 +10,10 @@
     gem.email = "[e-mail]"
     gem.homepage = "http://github.com/jdpace/PDFKit"
     gem.authors = ["jdpace"]
     gem.add_dependency "activesupport"
     gem.add_development_dependency "rspec", "~> 2.0.0.beta.8"
+    gem.add_development_dependency "rspec-core", "~> 2.0.0.beta.8"
     gem.add_development_dependency 'mocha'
     gem.files = [
       ".document",
        ".gitignore",
        "LICENSE",