DEP: Remove merger.OutlinesObject

[MartinThoma]

Closes #829

[codecov]

Codecov Report

Merging #847 (7ae26c3) into 2.0.0-dev (b5e0ee2) will increase coverage by 0.38%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           2.0.0-dev     #847      +/-   ##
=============================================
+ Coverage      82.11%   82.50%   +0.38%     
=============================================
  Files             15       15              
  Lines           3635     3612      -23     
  Branches         777      775       -2     
=============================================
- Hits            2985     2980       -5     
+ Misses           487      469      -18     
  Partials         163      163              

Impacted Files	Coverage Δ
PyPDF2/merger.py	70.58% <ø> (+3.80%)	⬆️

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