docs: add formatter option to configuration

Author: byCedric

docs/reference-configuration.md

@@ -18,6 +18,10 @@ type Config = {
      * Resolveable id to conventional-changelog parser preset to import and use
      */
     parserPreset?: string;
+    /*
+     * Resolveable id to package, from node_modules, which formats the output.
+     */
+    formatter: string;
     /*
      * Rules to check against
      */
@@ -35,6 +39,11 @@ const Configuration: Config = {
      * Referenced packages must be installed
      */
     parserPreset: 'conventional-changelog-atom',
+    /*
+     * Resolve and load @commitlint/format from node_modules.
+     * Referenced package must be installed
+     */
+    formatter: '@commitlint/format',
     /*
      * Any rules defined here will override rules from @commitlint/config-conventional
      */
@@ -136,6 +145,17 @@ module.exports = {
 };
 ```
 
+## Formatter
+
+Commitlint can output the issues encountered in different formats, if necessary.
+Use ids resolvable by the node resolve algorithm.
+
+```js
+module.exports = {
+    formatter: '@commitlint/format'
+};
+```
+
 ## Rules
 
 Refer to [Rules](reference-rules.md) for a complete list of available rules.