Update scriptLoading's default on README.md

As per listed in CHANGELOG and in https://github.com/jantimon/html-webpack-plugin/blob/74fae99c1294c01b71c8ea082fe1557cb5375322/index.js#L54, the default value for `scriptLoading` has changed to `'defer'`

Author: kenrick95

README.md

@@ -150,7 +150,7 @@ Allowed values are as follows:
 |**`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 `'body'` all javascript resources will be placed at the bottom of the body element. `'head'` will place the scripts in the head element. Passing `true` will add it to the head/body depending on the `scriptLoading` option. Passing `false` will disable automatic injections. - 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|
-|**`scriptLoading`**|`{'blocking'\|'defer'}`|`'blocking'`| Modern browsers support non blocking javascript loading (`'defer'`) to improve the page startup performance. |
+|**`scriptLoading`**|`{'blocking'\|'defer'}`|`'defer'`| 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'}`|
 |**`base`**|`{Object\|String\|false}`|`false`|Inject a [`base`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base) tag. E.g. `base: "https://example.com/path/page.html`|