Update README.rst

[KimKiHyuk]

[WARNING|middleware.py:418] Bad request to Splash: {'error': 400, 'type': 'BadOption', 'description': 'Incorrect HTTP API arguments', 'info': {'type': 'bad_argument', 'argument': 'render_all', 'description': "Pass non-zero 'wait' to render full webpage"}}

if wait argument not passed, that error occured.

[codecov[bot]]

Codecov Report

Merging #252 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #252   +/-   ##
=======================================
  Coverage   92.67%   92.67%           
=======================================
  Files           9        9           
  Lines         587      587           
  Branches      118      118           
=======================================
  Hits          544      544           
  Misses         21       21           
  Partials       22       22

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