Update show_object to (optionally) accept string

[lorenzncode]

• The string argument allows the name parameter to be omitted
• Consolidate show_object related sections of README

This change is proposed in #331.

[codecov[bot]]

Codecov Report

Merging #332 (5b0a21e) into master (4b461fe) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
+ Coverage   88.59%   88.66%   +0.07%     
==========================================
  Files          19       19              
  Lines        1490     1500      +10     
  Branches      204      206       +2     
==========================================
+ Hits         1320     1330      +10     
  Misses        137      137              
  Partials       33       33              

Impacted Files	Coverage Δ
cq_editor/widgets/debugger.py	83.03% <100.00%> (+0.79%)	:arrow_up:

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