Added sentance about default value

CONTRIBUTING.md

@@ -80,7 +80,7 @@ following fields:
 | `description`              | `string`   | yes      |                                              | A description of the change being made.<ul><li>Prefix with `**Breaking**:` if the change is breaking</li><li>Use the imperative present tense (e.g., "change" not "changed" nor "changes")</li><li>Capitalize first letter</li><li>No dot (.) at the end unless there are multiple sentences</li></ul>                                          |
 | `issues`                   | `string[]` | no       |                                              | A list of references to any related issues in the relevant repositories. A reference can be specified in several ways:<ul><li>The issue number, if local to this repository (eg. `#12345`)</li><li>A fully-qualified issue ID (eg.`awslabs/smithy-kotlin#12345`)</li><li>A fully-qualified URL (eg. `https://issuetracker.com/12345`)</li></ul> |
 | `module`                   | `string`   | no       |                                              | The area of the code affected by your changes. If unsure, leave this value unset.                                                                                                                                                                                                                                                               |
-| `requiresMinorVersionBump` | `boolean`  | no       |                                              | Indicates the change will require a new minor version. This is usually the case after a breaking change.                                                                                                                                                                                                                                        |
+| `requiresMinorVersionBump` | `boolean`  | no       |                                              | Indicates the change will require a new minor version. This is usually the case after a breaking change. Defaults to false if flag is not included.                                                                                                                                                                                             |
 
 The filename of an entry is arbitrary. We recommend `<id>.json`, where `<id>` corresponds to the `id` field of the entry
 itself.