Bump es6-promisify from 5.0.0 to 7.0.0

Bumps [es6-promisify](https://github.com/mikehall314/es6-promisify) from 5.0.0 to 7.0.0.
- [Release notes](https://github.com/mikehall314/es6-promisify/releases)
- [Commits](mikehall314/es6-promisify@v5.0.0...v7.0.0)

---
updated-dependencies:
- dependency-name: es6-promisify
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -20,7 +20,7 @@
   "homepage": "https://github.com/princed/postcss-modules-values-replace",
   "dependencies": {
     "enhanced-resolve": "^5.12.0",
-    "es6-promisify": "^5.0.0",
+    "es6-promisify": "^7.0.0",
     "icss-utils": "^5.1.0",
     "loader-utils": "^3.2.1",
     "postcss-values-parser": "^6.0.2"