Commits on Apr 1, 2018

1. fix: do not set boolean flags if not defined in argv …

   BREAKING CHANGE: `boolean` flags defined without a `default` value will now behave like other option type and won't be set in the parsed results when the user doesn't set the corresponding CLI arg.
   
   Previous behavior:
   ```js
   var parse = require('yargs-parser');
   
   parse('--flag', {boolean: ['flag']});
   // => { _: [], flag: true }
   
   parse('--no-flag', {boolean: ['flag']});
   // => { _: [], flag: false }
   
   parse('', {boolean: ['flag']});
   // => { _: [], flag: false }
   ```
   
   New behavior:
   ```js
   var parse = require('yargs-parser');
   
   parse('--flag', {boolean: ['flag']});
   // => { _: [], flag: true }
   
   parse('--no-flag', {boolean: ['flag']});
   // => { _: [], flag: false }
   
   parse('', {boolean: ['flag']});
   // => { _: [] } => flag not set similarly to other option type
   ```

   

   pvdlg committed Apr 1, 2018
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