Tests using `raises` are not being asserted

[czgdp1807]

Description of the problem

I was observing the test files and found that tests which use raises are not being asserted which was due to absence of return statement in,

pydatastructs/pydatastructs/utils/raises_util.py

Lines 3 to 16 in 8da8f36

	def raises(exception, code):
	"""
	Utility for testing exceptions.
	Parameters
	==========
	exception
	A valid python exception
	code: lambda
	Code that causes exception
	"""
	with pytest.raises(exception):
	code()

However with merging of #51 raises will return True on successful execution, hence all the tests of the following format,

raises(...)

are to be replace with the format below,

assert raises(...)

Example of the problem

References/Other comments

[TarunTomar122]

I can do this! Please assign it to me..

[czgdp1807]

Thanks for the interest. You can start working on it.
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