Add feature to display which plugins have been discovered

[daserok]

try to add feature from issue #229

[codecov]

Codecov Report

Merging #306 (b27a259) into master (1146a73) will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
- Coverage   84.65%   84.62%   -0.03%     
==========================================
  Files          21       21              
  Lines        1851     1854       +3     
  Branches      284      286       +2     
==========================================
+ Hits         1567     1569       +2     
  Misses        240      240              
- Partials       44       45       +1     

Impacted Files	Coverage Δ
ward/_run.py	85.45% <ø> (ø)
ward/_terminal.py	62.97% <66.66%> (+0.02%)	⬆️

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