Add back peer dependencies

Author: michaeldzjap

package-lock.json

@@ -30,6 +30,10 @@
   "bugs": {
     "url": "https://github.com/michaeldzjap/react-signature-pad-wrapper/issues"
   },
+  "peerDependencies": {
+    "react": "^15.5.0 || ^16.0.0 || ^17.0.0",
+    "react-dom": "^15.5.0 || ^16.0.0 || ^17.0.0"
+  },
   "devDependencies": {
     "@babel/core": "^7.11.6",
     "@babel/plugin-external-helpers": "^7.10.4",
@@ -59,8 +63,6 @@
     "prettier": "^2.1.1",
     "prettier-standard": "^16.4.1",
     "prop-types": "^15.7.2",
-    "react": "^17.0.1",
-    "react-dom": "^17.0.1",
     "rollup": "^2.26.11",
     "rollup-plugin-eslint": "^7.0.0",
     "rollup-plugin-terser": "^7.0.2",