Compat annotation for #28156 (splitpath).

Author: fredrikekre

base/path.jl

@@ -210,6 +210,9 @@ Split a file path into all its path components. This is the opposite of
 `joinpath`. Returns an array of substrings, one for each directory or file in
 the path, including the root directory if present.
 
+!!! compat "Julia 1.1"
+    This function requires at least Julia 1.1.
+
 # Examples
 ```jldoctest
 julia> splitpath("/home/myuser/example.jl")