bug(Header): Invalid propTypes validation

[layershifter]

We have bug with PropTypes in header.

Warning: Failed prop type: Header prop children conflicts with props: image. They cannot be defined together, choose one or the other.

<h4 class="ui image header">
  <img src="/images/avatar2/small/lena.png" class="ui mini rounded image">
  <div class="content">
    Lena
    <div class="sub header">Human Resources</div>
  </div>
</h4>

<Header as="h4" image>
  <Image src="http://semantic-ui.com/images/avatar2/small/lena.png" shape='rounded' size='mini'/>
  <Header.Content>
    Lena
    <Header.Subheader>Human Resources</Header.Subheader>
  </Header.Content>
</Header>

We can fix this with:

image: customPropTypes.every([
-  customPropTypes.disallow(['children', 'icon']),
+  customPropTypes.disallow(['icon']),
-  PropTypes.oneOfType([
-    PropTypes.string,
-    PropTypes.element,
-    PropTypes.object,
+  customPropTypes.givenProps(
+    { children: PropTypes.node.isRequired },
+    PropTypes.bool,
+  ),
+  customPropTypes.givenProps(
+    { image: PropTypes.oneOfType([PropTypes.string, PropTypes.element, PropTypes.object]) },
+    customPropTypes.disallow(['children']),
+  ),
  ]),
]),

I'll make PR?

[levithomason]

Yes please :)