message: fix(masthead): add new props to readme
diff: @@ -83,6 +83,8 @@ const platformData = {
  | `hasSearch` | Boolean | `true` | Includes IBM search |
  | `searchOpenOnload` | Boolean | `false` | Has the search open by default |
  | `placeHolderText` | String | `Search all of IBM` | Placeholder value for search input |
  +| `eyebrowLink` | String | | Link for eyebrow in L1 masthead |
  +| `title` | String | | Title for L1 masthead |
  ## Stable selectors
  