Remove unneeded peerDeps (#125)

Author: NullVoxPopuli

ember-element-helper/package.json

@@ -110,9 +110,6 @@
   "volta": {
     "extends": "../package.json"
   },
-  "peerDependencies": {
-    "ember-source": "^3.8 || ^4.0.0 || >= 5.0.0"
-  },
   "release-it": {
     "plugins": {
       "@release-it-plugins/lerna-changelog": {