Release v6.21.0

[nickdowell]

Enhancements

• Add configuration.reportBackgroundAppHangs to allow background app hangs to be reported.
  #1439

• Add freeMemory, memoryLimit and memoryUsage to metaData.app.
  Always report the device (not app) free memory in device.freeMemory.
  #1435

[github-actions]

Bugsnag.framework binary size decreased by 9,504 bytes from 814,536 to 805,032 🎉

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  +204% +9.28Ki    [__LINKEDIT]
   +21% +4.38Ki   +21% +4.38Ki    [__TEXT]
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  -2.1%     -40  -2.1%     -40    Function Start Addresses
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  -4.7%     -54  -4.7%     -54    __TEXT,__objc_classname
  -1.3%     -56  -1.3%     -56    Lazy Binding Info
  -2.8%     -56  -2.8%     -56    Rebase Info
  -0.8%     -56  -0.8%     -56    __DATA,__objc_selrefs
  -3.6%    -128  -3.6%    -128    __TEXT,__gcc_except_tab
  -4.3%    -160  -4.3%    -160    __DATA,__objc_data
  -1.1%    -182  -1.1%    -182    [9 Others]
  -3.9%    -360  -3.9%    -360    Export Info
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  -2.1%    -595  -2.1%    -595    __TEXT,__objc_methname
  -5.4% -1.09Ki  -5.4% -1.09Ki    __DATA,__cfstring
  -2.7% -1.32Ki  -2.7% -1.32Ki    __DATA,__objc_const
  -1.2% -3.06Ki  -1.2% -3.06Ki    __TEXT,__text
  -2.6% -3.80Ki  -2.6% -3.80Ki    Symbol Table
  -2.7% -4.96Ki  -2.7% -4.96Ki    String Table
   +33% +2.69Ki -91.8% -13.4Ki    [__DATA]
  -1.2% -9.28Ki  -2.0% -16.0Ki    TOTAL

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