fix readme (#1517)

`|` needs escape here.

Author: chenxsan

README.md

@@ -138,7 +138,7 @@ Allowed values are as follows
 |**`templateContent`**|`{string\|Function\|false}`|false| Can be used instead of `template` to provide an inline template - please read the [Writing Your Own Templates](https://github.com/jantimon/html-webpack-plugin#writing-your-own-templates) section |
 |**`templateParameters`**|`{Boolean\|Object\|Function}`| `false`| Allows to overwrite the parameters used in the template - see [example](https://github.com/jantimon/html-webpack-plugin/tree/master/examples/template-parameters) |
 |**`inject`**|`{Boolean\|String}`|`true`|`true \|\| 'head' \|\| 'body' \|\| false` Inject all assets into the given `template` or `templateContent`. When passing `true` or `'body'` all javascript resources will be placed at the bottom of the body element. `'head'` will place the scripts in the head element - see the [inject:false example](https://github.com/jantimon/html-webpack-plugin/tree/master/examples/custom-insertion-position)|
-|**`publicPath`**|`{String|'auto'}`|`'auto'`|The publicPath used for script and link tags|
+|**`publicPath`**|`{String\|'auto'}`|`'auto'`|The publicPath used for script and link tags|
 |**`scriptLoading`**|`{'blocking'\|'defer'}`|`'blocking'`| Modern browsers support non blocking javascript loading (`'defer'`) to improve the page startup performance. |
 |**`favicon`**|`{String}`|``|Adds the given favicon path to the output HTML|
 |**`meta`**|`{Object}`|`{}`|Allows to inject `meta`-tags. E.g. `meta: {viewport: 'width=device-width, initial-scale=1, shrink-to-fit=no'}`|