Update dependencies

Author: jsnanigans

package.json

@@ -55,15 +55,15 @@
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-watch": "^4.3.1",
-    "webpack-cli": "^3.1.0",
-    "webpack": "^4.14.0"
+    "webpack-cli": "^3",
+    "webpack": "^4 || ^3"
   },
   "dependencies": {
     "purgecss": "^1.0.1",
     "webpack-sources": "^1.1.0"
   },
   "peerDependencies": {
-    "webpack": "^4.11.1",
-    "webpack-cli": "^3.0.2"
+    "webpack": "^4 || ^3",
+    "webpack-cli": "^3"
   }
 }