Make react-native-windows an optionalDependency and match react-native to docs (#191)

Author: NathanJolly

CHANGELOG.md

@@ -1,4 +1,7 @@
 # CHANGELOG
+### 2.4.2
+
+- Make react-native-windows optional [#191](https://github.com/react-native-community/datetimepicker/pull/191)
 
 ### 2.4.0
 

package.json

@@ -71,13 +71,15 @@
     "react-test-renderer": "^16.11.0"
   },
   "peerDependencies": {
-    "react": ">=16.11",
-    "react-native": ">=0.61",
-    "react-native-windows": "^0.62.0-preview.1"
+    "react": ">=16.8.3",
+    "react-native": ">=0.59"
   },
   "dependencies": {
     "invariant": "^2.2.4"
   },
+  "optionalDependencies": {
+    "react-native-windows": "^0.62.0-preview.1"
+  },
   "detox": {
     "test-runner": "jest",
     "runner-config": "example/e2e/config.json",