Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 3.1.0 with the following command:
    transpec

* 424 conversions
    from: obj.should
      to: expect(obj).to

* 325 conversions
    from: == expected
      to: eq(expected)

* 38 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 15 conversions
    from: =~ /pattern/
      to: match(/pattern/)

* 9 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

* 5 conversions
    from: lambda { }.should_not
      to: expect { }.not_to

* 4 conversions
    from: lambda { }.should
      to: expect { }.to

* 2 conversions
    from: -> { }.should
      to: expect { }.to

* 2 conversions
    from: -> { }.should_not
      to: expect { }.not_to

* 1 conversion
    from: === expected
      to: be === expected

* 1 conversion
    from: =~ [1, 2]
      to: match_array([1, 2])

For more details: https://github.com/yujinakayama/transpec#supported-conversions

spec/components/letter_avatar_spec.rb

@@ -10,6 +10,6 @@ describe LetterAvatar do
 
     LetterAvatar.cleanup_old
 
-    Dir.entries(File.dirname(path)).length.should == 3
+    expect(Dir.entries(File.dirname(path)).length).to eq(3)
   end
 end