Update following ArrayInterface release

Author: Tokazama

Project.toml

@@ -1,7 +1,7 @@
 name = "StaticRanges"
 uuid = "d8176aec-3168-11e9-3c98-e3954798be3a"
 authors = ["zchristensen "]
-version = "0.8"
+version = "0.8.1"
 
 [deps]
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"

src/length.jl

@@ -13,6 +13,7 @@ function _unit_range_length(start::T, stop::T) where {T<:Union{UInt,UInt64,UInt1
         return Int(Base.checked_add(stop - start, one(T)))
     end
 end
+
 function _unit_range_length(start::T, stop::T) where {T}
     if start > stop
         return 0
@@ -76,13 +77,6 @@ lendiv(::LinSRange{T,B,E,L,D}) where {T,B,E,L,D} = D
 
 lendiv(r::LinMRange) = getfield(r, :lendiv)
 
-
-# TODO remoe this once it's defined in ArrayInterface
-ArrayInterface.known_length(::Type{T}) where {T} = nothing
-
-# some special cases to favor default Int type
-
-
 """
     can_set_length(x) -> Bool