BREAKING CHANGE: move uuid as an optional dependency.

This helps reduce the weight of code, especially when you don't intend on using uuids as ids

package.json

@@ -36,12 +36,14 @@
     "semantic-release": "semantic-release"
   },
   "dependencies": {
-    "event-to-promise": "^0.8.0",
-    "uuid": ">=3.0.1"
+    "event-to-promise": "^0.8.0"
   },
   "peerDependencies": {
     "mongoose": ">=4.0.0 || >=5.0.0"
   },
+  "optionalDependencies": {
+    "uuid": ">=3.0.1"
+  },
   "jest": {
     "roots": [
       "<rootDir>/src"
@@ -78,6 +80,7 @@
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.14.0",
     "tslint-plugin-prettier": "^1.3.0",
-    "typescript": "^3.0.1"
+    "typescript": "^3.0.1",
+    "uuid": ">=3.0.1"
   }
 }