[readme] Fix adapter package compatibility table

Gitbook does not seem to support escaping pipe characters inside of a backtick code block, instead breaking the table formatting. This can be resolved by using HTML escapes and the `<code>` tag.

Author: randak

README.md

@@ -43,7 +43,7 @@ React:
 | `enzyme-adapter-react-16` | `^16.4.0-0` |
 | `enzyme-adapter-react-16.3` | `~16.3.0-0` |
 | `enzyme-adapter-react-16.2` | `~16.2` |
-| `enzyme-adapter-react-16.1` | `~16.0.0-0 \|\| ~16.1` |
+| `enzyme-adapter-react-16.1` | <code>~16.0.0-0 &#124;&#124; ~16.1</code> |
 | `enzyme-adapter-react-15` | `^15.5.0` |
 | `enzyme-adapter-react-15.4` | `15.0.0-0 - 15.4.x` |
 | `enzyme-adapter-react-14` | `^0.14.0` |