Add IsNotType assertion

[bartventer]

This commit introduces the IsNotType assertion, which is the inverse of the existing IsType assertion. It allows users to assert that an object is not of a specific type.

Additionally, minor documentation improvements were made.

Summary

This PR adds a new assertion function, IsNotType, to the testify/assert package. It complements the existing IsType function by providing a way to assert that an object is not of a specific type.

Changes

• Added the IsNotType function to the assert package.
• Wrote unit tests for IsNotType to ensure correctness.
• Updated documentation to include examples and usage for IsNotType.

Motivation

The testify/assert package already provides an IsType function to check if an object is of a specific type. However, there was no built-in way to assert that an object is not of a specific type. This PR addresses that gap by introducing the IsNotType function, improving the library's completeness and usability.

Example usage

assert.IsNotType(t, &MyStruct{}, actualObject)

Related issues

N/A

[ccoVeille]

This sounds legitimate. I face the need this week too.

Please fix the small typos

[bartventer]

I have addressed all the requested changes:

• Fixed the typo in the source file.
• Regenerated the rest of the files which reflect the corrections.

Let me know if there's anything else you'd like me to adjust.

[ccoVeille]

LGTM 👍

Thanks