Remove development dependency on simplecov.

process_shared.gemspec

@@ -14,8 +14,8 @@ Gem::Specification.new do |s|
 
   s.add_dependency('ffi', '~> 1.0')
 
+  s.add_development_dependency('rake')
   s.add_development_dependency('rake-compiler')
   s.add_development_dependency('minitest')
   s.add_development_dependency('minitest-matchers')
-  s.add_development_dependency('simplecov')
 end

spec/spec_helper.rb

@@ -3,12 +3,6 @@ gem 'minitest'
 require 'minitest/spec'
 require 'minitest/autorun'
 require 'minitest/matchers'
-require 'simplecov'
-
-require 'process_shared'
-SimpleCov.start do
-  add_filter "/spec/"
-end
 
 class RangeMatcher
   def initialize(operator, limit)