Update dependency gulp-notify to v5 (#216)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [gulp-notify](https://redirect.github.com/mikaelbr/gulp-notify) |
[`4.0.0` ->
`5.0.0`](https://renovatebot.com/diffs/npm/gulp-notify/4.0.0/5.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/gulp-notify/5.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/gulp-notify/5.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/gulp-notify/4.0.0/5.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/gulp-notify/4.0.0/5.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>mikaelbr/gulp-notify (gulp-notify)</summary>

###
[`v5.0.0`](https://redirect.github.com/mikaelbr/gulp-notify/releases/tag/v5.0.0)

[Compare
Source](https://redirect.github.com/mikaelbr/gulp-notify/compare/v4.0.0...v5.0.0)

#### Maintenance release and bump node engine

Updated dependencies. Backwards compatible but bumping major version as
a breaking change in node version specified on engine (updated from
0.8.0!!)

</details>

---

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---

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package.json

@@ -19,7 +19,7 @@
     "ejs-lint": "2.0.0",
     "gulp": "4.0.2",
     "gulp-ejs": "5.1.0",
-    "gulp-notify": "4.0.0",
+    "gulp-notify": "5.0.0",
     "gulp-plumber": "1.2.1",
     "gulp-postcss": "10.0.0",
     "gulp-rename": "2.0.0",