update README

packages/gatsby-remark-embed-snippet/README.md

@@ -164,7 +164,11 @@ function App() {
 
 ## How to use
 
-**Important**: This module must appear before `gatsby-remark-prismjs` in your plugins array, or the markup will have already been transformed into a code block and this plugin will fail to detect it and inline the file.
+**Important**: This module must appear before `gatsby-remark-prismjs` in your
+plugins array, or the markup will have already been transformed into a code
+block and this plugin will fail to detect it and inline the file.
+For further information about its options, visit `gatsby-remark-prismjs`'s
+[README](https://www.gatsbyjs.org/packages/gatsby-remark-prismjs/).
 
 ```js
 // In your gatsby-config.js
@@ -177,15 +181,6 @@ module.exports = {
           {
             resolve: "gatsby-remark-embed-snippet",
             options: {
-              // Class prefix for <pre> tags containing syntax highlighting;
-              // defaults to 'language-' (eg <pre class="language-js">).
-              // If your site loads Prism into the browser at runtime,
-              // (eg for use with libraries like react-live),
-              // you may use this to prevent Prism from re-processing syntax.
-              // This is an uncommon use-case though;
-              // If you're unsure, it's best to use the default value.
-              classPrefix: "language-",
-
               // Example code links are relative to this dir.
               // eg examples/path/to/file.js
               directory: `${__dirname}/examples/`,
@@ -202,6 +197,29 @@ module.exports = {
               // This is an uncommon use-case though;
               // If you're unsure, it's best to use the default value.
               classPrefix: "language-",
+              // This is used to allow setting a language for inline code
+              // (i.e. single backticks) by creating a separator.
+              // This separator is a string and will do no white-space
+              // stripping.
+              // A suggested value for English speakers is the non-ascii
+              // character '›'.
+              inlineCodeMarker: null,
+              // This lets you set up language aliases.  For example,
+              // setting this to '{ sh: "bash" }' will let you use
+              // the language "sh" which will highlight using the
+              // bash highlighter.
+              aliases: {},
+              // This toggles the display of line numbers globally alongside the code.
+              // To use it, add the following line in gatsby-browser.js
+              // right after importing the prism color scheme:
+              //  `require("prismjs/plugins/line-numbers/prism-line-numbers.css");`
+              // Defaults to false.
+              // If you wish to only show line numbers on certain code blocks,
+              // leave false and use the {numberLines: true} syntax.
+              showLineNumbers: false,
+              // If setting this to true, the parser won't handle and highlight inline
+              // code used in markdown i.e. single backtick code like `this`.
+              noInlineHighlight: false,
             },
           },
         ],