drop Ruby 1.8 conditions and rcov

With the introduction of respond_to_missing? in
c17e20e, we no longer support Ruby 1.8.

Remove rcov, and unconditionally load simplecov.

Gemfile

@@ -9,5 +9,4 @@ gem "virtus", :git => "https://github.com/solnic/virtus.git"
 gem "activemodel"
 
 gem "ci_reporter"
-gem "rcov", :platforms => :ruby_18
-gem "simplecov", :platforms => :ruby_19
+gem "simplecov"

Rakefile

@@ -6,13 +6,4 @@ Rake::TestTask.new(:test) do |test|
   test.pattern = "test/**/*_test.rb"
 end
 
-if RUBY_VERSION < "1.9"
-  require "rcov/rcovtask"
-  Rcov::RcovTask.new do |t|
-    t.libs << "test"
-    t.test_files = FileList["test/**/*_test.rb"]
-    t.rcov_opts += %w{--exclude gems}
-  end
-end
-
 task :default => :test

test/test_helper.rb

@@ -22,10 +22,8 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 #++
-if RUBY_VERSION > "1.9"
-  require "simplecov"
-  SimpleCov.start
-end
+require "simplecov"
+SimpleCov.start
 
 require "bundler/setup"
 require "minitest/autorun"