Firebase Update

express-server/node_modules/serve-static/README.md

@@ -5,7 +5,6 @@
 [![Linux Build][travis-image]][travis-url]
 [![Windows Build][appveyor-image]][appveyor-url]
 [![Test Coverage][coveralls-image]][coveralls-url]
-[![Gratipay][gratipay-image]][gratipay-url]
 
 ## Install
 
@@ -44,7 +43,7 @@ of the `Range` request header.
 ##### cacheControl
 
 Enable or disable setting `Cache-Control` response header, defaults to
-true. Disabling this will ignore the `maxAge` option.
+true. Disabling this will ignore the `immutable` and `maxAge` options.
 
 ##### dotfiles
 
@@ -93,6 +92,14 @@ all methods.
 
 The default value is `true`.
 
+##### immutable
+
+Enable or disable the `immutable` directive in the `Cache-Control` response
+header, defaults to `false`. If set to `true`, the `maxAge` option should
+also be specified to enable caching. The `immutable` directive will prevent
+supported clients from making conditional requests during the life of the
+`maxAge` option to check if the file has changed.
+
 ##### index
 
 By default this module will send "index.html" files in response to a request
@@ -249,5 +256,3 @@ function setCustomCacheControl (res, path) {
 [coveralls-url]: https://coveralls.io/r/expressjs/serve-static
 [downloads-image]: https://img.shields.io/npm/dm/serve-static.svg
 [downloads-url]: https://npmjs.org/package/serve-static
-[gratipay-image]: https://img.shields.io/gratipay/dougwilson.svg
-[gratipay-url]: https://gratipay.com/dougwilson/