Migration guide pattern incorrect

[dahst]

https://github.com/ng-apimock/core/blob/master/MIGRATION.md

The core processor example uses 'pattern' when it should be 'patterns'.

[Mischa Dasberg]

@dahst thanks for reporting the issue

[Mischa Dasberg]

🎉 This issue has been resolved in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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