typo(it was written kNN should have been KNN)

[sai-krishna-msk]

All Submissions Basics:

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [x] Have you checked all Issues to tie the PR to a specific one?

All Submissions Cores:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully ran tests with your changes locally?
• [x] Does your submission pass tests, including CircleCI, Travis CI, and AppVeyor?
• [x] Does your submission have appropriate code coverage? The cutoff threshold is 95% by Coversall.

New Model Submissions:

• [ ] Have you created a <NewModel>.py in ~/pyod/models/?
• [ ] Have you created a <NewModel>_example.py in ~/examples/?
• [ ] Have you created a test_<NewModel>.py in ~/pyod/test/?
• [ ] Have you lint your code locally prior to submission?

[coveralls]

Pull Request Test Coverage Report for Build 1990

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.615%

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Totals
Change from base Build 1973:	0.0%
Covered Lines:	5015
Relevant Lines:	5245

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💛 - Coveralls