Support function call for setting propTypes

For example, using `Object.assign` for setting the propTypes like this:
```
function Foo() {...}

Foo.propTypes = Object.assign({}, morePropTypes, { isLoading:
PropTypes.bool });
```

Author: jomasti

lib/rules/boolean-prop-naming.js

@@ -180,7 +180,12 @@ module.exports = {
           return;
         }
         const component = utils.getRelatedComponent(node);
-        if (!component || !node.parent.right.properties) {
+        if (!component || !node.parent.right) {
+          return;
+        }
+        const right = node.parent.right;
+        if (right.type === 'CallExpression') {
+          right.arguments.filter(arg => arg.type === 'ObjectExpression').forEach(object => validatePropNaming(component.node, object.properties));
           return;
         }
         validatePropNaming(component.node, node.parent.right.properties);

tests/lib/rules/boolean-prop-naming.js

@@ -101,17 +101,7 @@ ruleTester.run('boolean-prop-naming', rule, {
     options: [{
       rule: '^is[A-Z]([A-Za-z0-9]?)+'
     }]
-  }, {
-    // ES6 components as React.Component with non-boolean PropTypes
-    code: `
-      class Hello extends React.Component {
-        render () { return <div />; }
-      }
-      Hello.propTypes = wrap({ a: PropTypes.bool })
-    `,
-    options: [{
-      rule: '^is[A-Z]([A-Za-z0-9]?)+'
-    }]
+
   }, {
     code: `
       class Hello extends React.Component {
@@ -458,5 +448,32 @@ ruleTester.run('boolean-prop-naming', rule, {
     }, {
       message: 'Prop name (somethingElse) doesn\'t match rule (^is[A-Z]([A-Za-z0-9]?)+)'
     }]
+  }, {
+    code: `
+    function Card(props) {
+      return <div>{props.showScore ? 'yeh' : 'no'}</div>;
+    }
+    Card.propTypes = merge({}, Card.propTypes, {
+        showScore: PropTypes.bool
+    });`,
+    options: [{
+      rule: '^(is|has)[A-Z]([A-Za-z0-9]?)+'
+    }],
+    errors: [{
+      message: 'Prop name (showScore) doesn\'t match rule (^(is|has)[A-Z]([A-Za-z0-9]?)+)'
+    }]
+  }, {
+    code: `
+      class Hello extends React.Component {
+        render () { return <div />; }
+      }
+      Hello.propTypes = wrap({ a: PropTypes.bool })
+    `,
+    options: [{
+      rule: '^is[A-Z]([A-Za-z0-9]?)+'
+    }],
+    errors: [{
+      message: 'Prop name (a) doesn\'t match rule (^is[A-Z]([A-Za-z0-9]?)+)'
+    }]
   }]
 });