Remove unsupported peer dependencies

Author: jhnns

package.json

@@ -27,8 +27,8 @@
   "author": "J. Tangelder",
   "license": "MIT",
   "peerDependencies": {
-    "node-sass": "^3.4.2 || ^4.0.0",
-    "webpack": "^2 || ^2.2.0-rc.0 || ^2.1.0-beta || ^1.12.6"
+    "node-sass": "^4.0.0",
+    "webpack": "^2.0.0"
   },
   "dependencies": {
     "async": "^2.0.1",