Add IsEqual Argument Matcher

[ghostwriter]

This pr adds an IsEqual Argument Matcher

Resolves #1268

[codecov-commenter]

Codecov Report

Merging #1276 (62da68b) into 1.6.x (ecadf99) will decrease coverage by 0.05%.
The diff coverage is 50.00%.

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Additional details and impacted files

@@             Coverage Diff              @@
##              1.6.x    #1276      +/-   ##
============================================
- Coverage     77.60%   77.56%   -0.05%     
- Complexity     1000     1002       +2     
============================================
  Files            75       76       +1     
  Lines          2532     2536       +4     
============================================
+ Hits           1965     1967       +2     
- Misses          567      569       +2     

Impacted Files	Coverage Δ
library/Mockery/Matcher/IsEqual.php	50.00% <50.00%> (ø)

[ruudk]

Thanks @ghostwriter 💙

Would it be possible to tag this?

[oprypkhantc]

@ghostwriter Would a PR adding a factory method for new IsEqual and IsSame matchers to Mockery be welcomed, similar to how Mockery::any() exist? i.e.

class Mockery {
    public static function equal($other) {
        return new IsEqual($other);
    }
}

[ghostwriter]

Hey @oprypkhantc,

As you requested, I have included the factory methods for both IsEqual and IsSame in pull request #1336.

By the way, for future reference, please create a new issue so that we can keep old and new issues and requests separate.

Thanks