Commits on Aug 8, 2019

1. Add "Assert Nil" rule …

   Use `assert_nil` if expecting `nil`.
   
   ```ruby
   # bad
   assert_equal(nil, actual)
   
   # good
   assert_nil(actual)
   ```
   
   This rule prevents the following MT6's deprecated warning:
   
   ```ruby
   class ExampleTest < Minitest::Test
     def test_expecting_nil
       foo = nil
   
       assert_equal(nil, foo)
     end
   end
   ```
   
   ```console
   % bundle exec rake test
   Run options: --seed 16727
   
   # Running:
   
   DEPRECATED: Use assert_nil if expecting nil from
   /Users/koic/src/github.com/rubocop-hq/rubocop-minitest/test/rubocop/minitest_test.rb:13. This
   will fail in Minitest 6.
   ```
   
   https://github.com/seattlerb/minitest/blob/ab39d35fb4e84eb866ed9c4ecb707cbf3889de42/lib/minitest/assertions.rb#L203

   

   koic committed Aug 8, 2019
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