Update typealias to a const

Part of JuliaLang/julia#20418

Author: omus

src/Olson.jl

@@ -51,9 +51,9 @@ type Rule
     end
 end
 
-typealias ZoneDict Dict{AbstractString,Array{Zone}}
-typealias RuleDict Dict{AbstractString,Array{Rule}}
-typealias OrderedRuleDict Dict{AbstractString,Tuple{Array{Date},Array{Rule}}}
+const ZoneDict = Dict{AbstractString,Array{Zone}}
+const RuleDict = Dict{AbstractString,Array{Rule}}
+const OrderedRuleDict = Dict{AbstractString,Tuple{Array{Date},Array{Rule}}}
 
 # Min and max years that we create DST transition DateTimes for (inclusive)
 const MIN_YEAR = year(typemin(DateTime))  # Essentially the begining of time

test/utils.jl

@@ -43,7 +43,7 @@ Base.isequal(a::Array{Expr}, b::Array{Expr}) = map(strip, a) == map(strip, b)
     ],
 )
 
-typealias I Integer
+const I = Integer
 @test isequal(
     optional(
         :(function ZonedDateTime(y::I, m::I=1, d::I=1, h::I=0, mi::I=0, s::I=0, ms::I=0, tz::TimeZone)