Bump node-sass from 4.12.0 to 4.13.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.12.0 to 4.13.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.12.0...v4.13.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/js/highlight/dart.js b/js/highlight/dart.js
index 370e3d9b0..36d6c6d5c 100644
--- a/js/highlight/dart.js
+++ b/js/highlight/dart.js
@@ -1,2 +1,2 @@
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\ No newline at end of file
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\ No newline at end of file