Fix splitarg example in README

Author: cstjean

README.md

@@ -231,13 +231,14 @@ all_params = [get(dict, :params, [])..., get(dict, :whereparams, [])...]
 ```
 
 `splitarg(arg)` matches function arguments (whether from a definition or a function call)
-such as `x::Int=2` and returns `(arg_name, arg_type, default)`. `default` is `nothing`
-when there is none. For example:
+such as `x::Int=2` and returns `(arg_name, arg_type, slurp, default)`. `default` is
+`nothing` when there is none. For example:
 
 ```julia
-> map(splitarg, (:(f(a=2, x::Int=nothing, y))).args[2:end])
-3-element Array{Tuple{Symbol,Symbol,Any},1}:
- (:a, :Any, 2)       
- (:x, :Int, :nothing)
- (:y, :Any, nothing)
+> map(splitarg, (:(f(y, a=2, x::Int=nothing, args...))).args[2:end])
+4-element Array{Tuple{Symbol,Symbol,Bool,Any},1}:
+ (:y, :Any, false, nothing)  
+ (:a, :Any, false, 2)        
+ (:x, :Int, false, :nothing) 
+ (:args, :Any, true, nothing)
 ```