removing special characters

Author: jkyberneees

README.md

@@ -83,7 +83,7 @@ When using the Cache-Control header, you can omit the custom `x-cache-timeout` h
 
 #### Direct usage: 
 ```js 
-res.setHeader('cache-control', `private, no-cache, max-age=${60 * 5}`) 
+res.setHeader('cache-control', 'private, no-cache, max-age=300')
 res.setHeader('etag', '1')
 
 res.end('5 minutes cacheable content here....')
@@ -96,7 +96,7 @@ res.setHeader('x-cache-timeout', '5 minutes')
 ```
 The middleware will now transparently generate default `Cache-Control` and `ETag` headers as described below:
 ```js 
-res.setHeader('cache-control', `private, no-cache, max-age=300`) 
+res.setHeader('cache-control', 'private, no-cache, max-age=300')
 res.setHeader('etag', '1')
 ```
 This will enable browser clients to keep a copy of the cache on their side, but still being forced to validate