bidirect_index.py:12-17: Implement bidirect index pattern...

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The puzzle 139-732b1bcc from #139 has to be resolved:

aibolit/aibolit/patterns/bidirect_index/bidirect_index.py

Lines 12 to 17 in 42a4ae6

	@todo #139:30min Implement bidirect index pattern
	If the same numeric variable is incremented and decremented within the same method,
	it's a pattern. A numeric variable should either be always growing or decreasing.
	Bi-directional index is confusing. The method must return a list with the line numbers
	of the variables that match this pattern. After implementation, activate tests in
	test_bidirect_index.py

The puzzle was created by Evgeny Maslov on 06-Jul-20.

Estimate: 30 minutes, role: DEV.

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