#565, #566 and minor repairs

[stevennic]

Addressing #565, #566 and some minor repairs.

For the readme, I'm proposing we remove the unhelpful comments, because the correct answer is redundant anyway, since it's standard Github process.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@f846e4a). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #568   +/-   ##
=========================================
  Coverage          ?   83.05%           
=========================================
  Files             ?      132           
  Lines             ?    29657           
  Branches          ?        0           
=========================================
  Hits              ?    24631           
  Misses            ?     5026           
  Partials          ?        0           

Impacted Files	Coverage Δ
src/whoosh/codec/whoosh3.py	95.09% <100.00%> (ø)
tests/test_collector.py	99.41% <100.00%> (ø)
tests/test_matching.py	95.08% <100.00%> (ø)

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