chore: make prop types as dependency

Author: SMAKSS

package.json

@@ -4,10 +4,12 @@
     "url": "https://github.com/SMAKSS/react-scroll-direction/issues"
   },
   "description": "Detect scroll direction in react applications.",
+  "dependencies": {
+    "prop-types": "^15.8.1"
+  },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^24.0.0",
     "@rollup/plugin-node-resolve": "^15.0.1",
-    "prop-types": "^15.8.1",
     "rollup": "^3.2.3"
   },
   "exports": {