writeexcel.gemspec in writeexcel-1.0.5 vs writeexcel.gemspec in writeexcel-1.0.6

@@ -5,20 +5,21 @@
 
 Gem::Specification.new do |gem|
   gem.name          = "writeexcel"
   gem.version       = WriteExcel::VERSION
   gem.authors       = ["Hideo NAKAMURA"]
-  gem.email         = ["[e-mail]"]
+  gem.email         = ["[e-mail]"]
   gem.description   = "Multiple worksheets can be added to a workbook and formatting can be applied to cells. Text, numbers, formulas, hyperlinks and images can be written to the cells."
   gem.summary       = "Write to a cross-platform Excel binary file."
   gem.homepage      = "http://github.com/cxn03651/writeexcel#readme"
   gem.license       = 'MIT'
 
   gem.files         = `git ls-files`.split($/)
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
-  gem.add_development_dependency 'test-unit'
+  gem.add_development_dependency 'minitest'
+  gem.add_development_dependency 'rake'
   gem.extra_rdoc_files = [
     "LICENSE.txt",
     "README.rdoc"
   ]
   gem.add_development_dependency 'simplecov'