Added version attributes

[czgdp1807]

References to other Issues or PRs or Relevant literature

Brief description of what is fixed or changed

Other comments

[codecov]

Codecov Report

Merging #420 (38db095) into master (3bd7e5a) will increase coverage by 0.000%.
The diff coverage is 100.000%.

@@            Coverage Diff            @@
##            master      #420   +/-   ##
=========================================
  Coverage   98.573%   98.573%           
=========================================
  Files           29        29           
  Lines         3645      3646    +1     
=========================================
+ Hits          3593      3594    +1     
  Misses          52        52           

Impacted Files	Coverage Δ
docs/source/conf.py	100.000% <100.000%> (ø)
pydatastructs/__init__.py	100.000% <100.000%> (ø)