[DownView] Add parameter so bundle is writable

[brunnobga]

Closes #198

[codecov]

Codecov Report

Merging #200 into master will increase coverage by 37.21%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master     #200       +/-   ##
===========================================
+ Coverage   32.86%   70.07%   +37.21%     
===========================================
  Files          74       74               
  Lines        2048     2042        -6     
===========================================
+ Hits          673     1431      +758     
+ Misses       1375      611      -764     

Impacted Files	Coverage Δ
Source/Views/DownView.swift	0.00% <0.00%> (-83.15%)	⬇️
Source/Extensions/String+ToHTML.swift	0.00% <0.00%> (-100.00%)	⬇️
Tests/AST/ListItemPrefixGeneratorTests.swift	0.00% <0.00%> (-100.00%)	⬇️
Tests/Styler/Helpers/CGRect_HelpersTests.swift	0.00% <0.00%> (-100.00%)	⬇️
Tests/Styler/Helpers/CGPoint_TranslateTests.swift	0.00% <0.00%> (-100.00%)	⬇️
...yler/Helpers/NSAttributedString+HelpersTests.swift	0.00% <0.00%> (-100.00%)	⬇️
...rs/NSMutableAttributedString+AttributesTests.swift	0.00% <0.00%> (-99.15%)	⬇️
Tests/AST/NodeTests.swift	0.00% <0.00%> (-96.16%)	⬇️
Source/Extensions/NSAttributedString+HTML.swift	0.00% <0.00%> (-87.50%)	⬇️
Source/Renderers/DownXMLRenderable.swift	0.00% <0.00%> (-83.34%)	⬇️
... and 50 more

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[iwasrobbed]

Hi @brunnobga 👋 Thanks for the pull request! Please add a unit test (see examples in https://github.com/iwasrobbed/Down/blob/master/Tests/DownViewTests.swift) and then this can get merged 👍

[brunnobraga]

Added a unit test to cover the boolean option I added. It would never actually fail on simulator since WKWebView doesn't apply the same permissions restrictions as on a real device. But it illustrates its purpose.

[iwasrobbed]

Thanks @brunnobga 👍