README.md in weak_parameters-0.1.5 vs README.md in weak_parameters-0.1.6

@@ -53,9 +53,10 @@
 * float
 * hash
 * integer
 * string
 * boolean (= 0, 1, false, true)
+* file
 
 ### Avilable options
 * required
 * only
 * except