rm react-native-picker/picker as a dependency and add it as dev and peer

Author: luacmartins

README.md

@@ -21,6 +21,8 @@ For either platform, you can alternatively pass down a child element of your cho
 
 ### Installing
 
+This package is built around and depends on [@react-native-picker/picker](https://github.com/react-native-picker/picker). Please make sure you install it correctly (as seen below in installation steps).
+
 ```
 npm install react-native-picker-select
 

package.json

@@ -24,7 +24,6 @@
         "/src"
     ],
     "dependencies": {
-        "@react-native-picker/picker": "^1.8.3",
         "lodash.isequal": "^4.5.0"
     },
     "devDependencies": {
@@ -43,8 +42,12 @@
         "react": "16.6.1",
         "react-dom": "^16.6.1",
         "react-native": "0.57.7",
+        "@react-native-picker/picker": ">=2.1.0",
         "react-test-renderer": "^16.6.1"
     },
+    "peerDependencies": {
+        "@react-native-picker/picker": ">=2.1.0"
+    },
     "scripts": {
         "test": "jest",
         "test:watch": "jest --watch",