Bump is-plain-obj from 2.1.0 to 3.0.0 (#30)

Bumps [is-plain-obj](https://github.com/sindresorhus/is-plain-obj) from 2.1.0 to 3.0.0.
- [Release notes](https://github.com/sindresorhus/is-plain-obj/releases)
- [Commits](sindresorhus/is-plain-obj@v2.1.0...v3.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -44,7 +44,7 @@
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jest": "^24.1.3",
     "eslint-plugin-prettier": "^3.3.0",
-    "is-plain-obj": "^2.1.0",
+    "is-plain-obj": "^3.0.0",
     "jest": "^26.6.3",
     "npm-package-json-lint": "^5.1.0",
     "npm-package-json-lint-config-tc": "^4.0.0",