Added minitest-spec-context to readme. (ywen)

[git-p4: depot-paths = "//src/minitest/dev/": change = 8401]

README.txt

@@ -370,6 +370,7 @@ minitest-rails-capybara     :: Capybara integration for MiniTest::Rails
 minitest-reporters          :: Create customizable MiniTest output formats
 minitest-should_syntax      :: RSpec-style +x.should == y+ assertions for MiniTest
 minitest-shouldify          :: Adding all manner of shoulds to MiniTest (bad idea)
+minitest-spec-context       :: Provides rspec-ish context method to MiniTest::Spec
 minitest-spec-magic         :: Minitest::Spec extensions for Rails and beyond
 minitest-spec-rails         :: Drop in MiniTest::Spec superclass for ActiveSupport::TestCase.
 minitest-stub-const         :: Stub constants for the duration of a block
@@ -399,7 +400,6 @@ Authors... Please send me a pull request with a description of your minitest ext
 * minitest-extra-assertions
 * minitest-rails-shoulda
 * minitest-spec
-* minitest-spec-context
 * minitest-spec-should
 * minitest-sugar
 * minitest_should