fix(readme): markdown on a long description for skipValidation (#548)

fixup markdown on a long option description for `skipValidation`

README.md

@@ -1159,8 +1159,7 @@ For this target to work correctly, either `dart` must be installed on the system
 | ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `dartCliPath`    | **optional** Path to the Dart CLI. It must be executable by the calling process. Defaults to `dart`.                                                                                            |
 | `packages`       | **optional** List of directories to be released, relative to the root. Useful when a single repository contains multiple packages. When skipped, root directory is assumed as the only package. |
-| `skipValidation` | **optional** Publishes the package without going through validation steps, such as analyzer & dependency checks. This is useful in particular situations when package maintainers know why the validation fails and wish to side step the issue. For example, there may be analyzer issues due to not following the current (latest) dart SDK recommendation because the package needs to maintain the package compatibility with an old SDK version. 
-This option should be used with caution and only after testing and verifying the reported issue shouldn't affect the package. It is advisable to do an alpha pre-release to further reduce the chance of a potential negative impact. |
+| `skipValidation` | **optional** Publishes the package without going through validation steps, such as analyzer & dependency checks. <br /> This is useful in particular situations when package maintainers know why the validation fails and wish to side step the issue. For example, there may be analyzer issues due to not following the current (latest) dart SDK recommendation because the package needs to maintain the package compatibility with an old SDK version. <br /> This option should be used with caution and only after testing and verifying the reported issue shouldn't affect the package. It is advisable to do an alpha pre-release to further reduce the chance of a potential negative impact. |
 
 **Example**