feat: Assume --trailing-commas if --trim-trailing-commas is requested

It can be expected, if the trailing commas need to be trimmed, that they can appear
in the intput. This should not break any existing scenarios.

Fixes #22.

Author: prantlf

lib/cli.js

@@ -295,7 +295,7 @@ function processContents (source, file) {
       mode: params.mode,
       ignoreBOM: params.bom,
       ignoreComments: params.comments,
-      ignoreTrailingCommas: params.trailingCommas,
+      ignoreTrailingCommas: params.trailingCommas || params.trimTrailingCommas,
       allowSingleQuotedStrings: params.singleQuotedStrings,
       allowDuplicateObjectKeys: params.duplicateKeys
     }

web/jsonlint.html

@@ -338,6 +338,7 @@ <h2>Result</h2>
             ignoreComments: document.getElementById('comments').checked ||
                             mode === 'cjson' || mode === 'json5',
             ignoreTrailingCommas: document.getElementById('trailing-commas').checked ||
+                                  document.getElementById('trim-trailing-commas').checked ||
                                   mode === 'json5',
             allowSingleQuotedStrings: document.getElementById('single-quoted-strings').checked ||
                                       mode === 'json5',