Killer features section has some grammatical errors

[janithRS]

Describe the bug
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the second point of the killer features section has some grammatical errors.

To Reproduce

Write a runnable test case using the code sandbox template: https://codesandbox.io/s/yup-test-case-gg1g1
In the index.test.js file change the passing test to a failing one demostrating your issue

NOTE: if you do not provide a runnable reproduction the chances of getting feedback are significantly lower

navigate to read me - killer features section.

Expected behavior
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Powerful TypeScript support. Infer static types from the schema, or ensure the schema correctly implements a type

Platform (please complete the following information):

• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context
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