Enabling pattern matching on ECError

[Andrew-Lees11]

fixes issue #11. This pull request allows you to pattern match an ECError against a general error.
This was added to SwiftJWT by the community in pr 45 and is a nice little addition that we would like to bring here as well.

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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