Remove default target blank from links

src/components.js

@@ -44,7 +44,6 @@ const h6 = styled(h3.withComponent('h6'))([], css('h6'))
 
 const a = styled.a([], color, css('link'), css('a'))
 a.defaultProps = {
-  target: '_blank',
   color: 'link'
 }
 

test/__snapshots__/components.js.snap

@@ -8,7 +8,6 @@ exports[`renders a 1`] = `
 <a
   className="c0"
   color="link"
-  target="_blank"
 />
 `;