deps(dev): bump it-drain from 1.0.5 to 2.0.0

Bumps [it-drain](https://github.com/achingbrain/it) from 1.0.5 to 2.0.0.
- [Release notes](https://github.com/achingbrain/it/releases)
- [Commits](https://github.com/achingbrain/it/compare/it-drain@1.0.5...it-drain-v2.0.0)

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

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

package.json

@@ -155,7 +155,7 @@
     "aegir": "^37.4.8",
     "delay": "^5.0.0",
     "it-all": "^1.0.6",
-    "it-drain": "^1.0.5",
+    "it-drain": "^2.0.0",
     "p-defer": "^4.0.0",
     "streaming-iterables": "^7.0.4"
   }