fix: properly handle a false value for the parseImgDimensions option

[paviad]

Contains two fixes:

1. Change the default value of the parseImgDimensions option to true (also in documentation)
2. Properly reject image dimensions when the option is set to false

Closes #984

[joshiayush]

Just add options.parseImgDimensions down in the if clause:

    if (options.parseImgDimensions && width && height) {
      width  = (width === '*') ? 'auto' : width;
      height = (height === '*') ? 'auto' : height;
      result += ' width="' + width + '"';
      result += ' height="' + height + '"';
    }

Look, the desired behaviour should be this.

[codeclimate]

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[paviad]

Resolved all issues, new behavior will not reject dimensions, but will simply ignore them.

[joshiayush]

This PR fixes #984 👍