fix typing hints to include io.BytesIO

[codecov[bot]]

Codecov Report

Merging #791 (d4107f6) into stable (639c169) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            stable      #791   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines         1414      1414           
=========================================
  Hits          1414      1414           

Impacted Files	Coverage Δ
pdfplumber/display.py	100.00% <100.00%> (ø)
pdfplumber/pdf.py	100.00% <100.00%> (ø)

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[jsvine]

Thanks, looks good! Merging.