Remove argument types from API docs

They're already mentioned in the usage section. It's pretty obvious and I don't think it's worth the amount of bloat they add.

README.md

@@ -93,46 +93,14 @@ expired.on(headers)
 
 Returns a boolean relating to whether the resource has expired or not. `true` means it's expired, `false` means it's fresh.
 
-#### headers
-
-Type: `string`, `object`<br>
-
-String or object containing HTTP headers.
-
-#### date
-
-Type: `Date`<br>
-Default: `new Date()`
-
-Optional `Date` object to compare against.
-
 ### expired.in(headers, [date])
 
 Returns the amount of milliseconds from the current date until the resource will expire. If the resource has already expired it will return a negative integer.
 
-#### headers
-
-Type: `string`, `object`<br>
-
-String or object containing HTTP headers.
-
-#### date
-
-Type: `Date`<br>
-Default: `new Date()`
-
-Optional `Date` object to compare against.
-
 ### expired.on(headers)
 
 Returns a JavaScript `Date` object for the date the resource will expire.
 
-#### headers
-
-Type: `string`, `object`<br>
-
-String or object containing HTTP headers.
-
 ## License
 
 MIT © Luke Childs