fix(PropTypes): Get proptypes from 'prop-types'

* Updated prop-types

* Updated package.json with version property

* Update package.json

index.js

@@ -1,5 +1,5 @@
 import React, {Component} from 'react'
-
+import PropTypes from 'prop-types'
 import {
   View,
   Dimensions,
@@ -70,7 +70,7 @@ class InView extends Component{
       <View ref="myview" {...this.props} onLayout={event => this.onLayout(event)}>
         {this.props.children}
       </View>
-    )    
+    )
   }
 }
 
@@ -79,9 +79,9 @@ InView.defaultProps = {
   delay: 100,
 }
 InView.propTypes = {
-  onChange: React.PropTypes.func.isRequired,
-  active: React.PropTypes.bool,
-  delay: React.PropTypes.number
+  onChange: PropTypes.func.isRequired,
+  active: PropTypes.bool,
+  delay: PropTypes.number
 }
 
-module.exports = InView
+module.exports = InView

package.json

@@ -16,6 +16,9 @@
     "url": "https://github.com/stoffern/react-native-inview/issues"
   },
   "homepage": "https://github.com/stoffern/react-native-inview#readme",
+  "dependencies": {
+    "prop-types": "^15.6.0"
+  },
   "devDependencies": {
     "cz-conventional-changelog": "^2.0.0",
     "semantic-release": "^8.0.3"