Minor edit

[sadrasabouri]

What does this implement/fix? Explain your changes.

• Installation instruction modified
• Test system optimized
• Different ways of the matplotlib import unified
• doctests' issues fixed

[codecov[bot]]

Codecov Report

Merging #193 (c99e14d) into dev (76f3f48) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev      #193   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          617       615    -2     
  Branches        94        94           
=========================================
- Hits           617       615    -2     

Impacted Files	Coverage Δ
samila/functions.py	100.00% <100.00%> (ø)
samila/params.py	100.00% <100.00%> (ø)