build(deps-dev): bump split2 from 3.2.2 to 4.0.0 (#1163)

Bumps [split2](https://github.com/mcollina/split2) from 3.2.2 to 4.0.0.
- [Release notes](https://github.com/mcollina/split2/releases)
- [Commits](mcollina/split2@v3.2.2...v4.0.0)

---
updated-dependencies:
- dependency-name: split2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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package.json

@@ -89,7 +89,7 @@
     "proxyquire": "^2.1.3",
     "pump": "^3.0.0",
     "semver": "^7.0.0",
-    "split2": "^3.1.1",
+    "split2": "^4.0.0",
     "steed": "^1.1.3",
     "strip-ansi": "^6.0.0",
     "tap": "^15.0.1",