Swap React.PropTypes to using standalone prop-types package

assets/js/src/common/key_value_table.jsx

@@ -1,3 +1,4 @@
+import PropTypes from 'prop-types';
 import React from 'react';
 
 const KeyValueTable = props => (
@@ -13,13 +14,13 @@ const KeyValueTable = props => (
 );
 
 KeyValueTable.propTypes = {
-  max_width: React.PropTypes.string,
-  rows: React.PropTypes.arrayOf(React.PropTypes.shape({
-    key: React.PropTypes.string.isRequired,
-    value: React.PropTypes.oneOfType([
-      React.PropTypes.string,
-      React.PropTypes.number,
-      React.PropTypes.element,
+  max_width: PropTypes.string,
+  rows: PropTypes.arrayOf(PropTypes.shape({
+    key: PropTypes.string.isRequired,
+    value: PropTypes.oneOfType([
+      PropTypes.string,
+      PropTypes.number,
+      PropTypes.element,
     ]).isRequired,
   })).isRequired,
 };

assets/js/src/common/print_boolean.jsx

@@ -1,3 +1,4 @@
+import PropTypes from 'prop-types';
 import React from 'react';
 import MailPoet from 'mailpoet';
 
@@ -10,10 +11,10 @@ const PrintBoolean = props => (
 );
 
 PrintBoolean.propTypes = {
-  truthy: React.PropTypes.string,
-  falsy: React.PropTypes.string,
-  unknown: React.PropTypes.string,
-  children: React.PropTypes.bool,
+  truthy: PropTypes.string,
+  falsy: PropTypes.string,
+  unknown: PropTypes.string,
+  children: PropTypes.bool,
 };
 
 PrintBoolean.defaultProps = {

assets/js/src/common/stepped_progess_bar.jsx

@@ -1,3 +1,4 @@
+import PropTypes from 'prop-types';
 import React from 'react';
 
 const SteppedProgressBar = (props) => {
@@ -20,8 +21,8 @@ const SteppedProgressBar = (props) => {
 };
 
 SteppedProgressBar.propTypes = {
-  steps_count: React.PropTypes.number.isRequired,
-  step: React.PropTypes.number.isRequired,
+  steps_count: PropTypes.number.isRequired,
+  step: PropTypes.number.isRequired,
 };
 
 module.exports = SteppedProgressBar;