Deprecate All (#28)

Author: bkamins

Project.toml

@@ -1,7 +1,7 @@
 name = "DataAPI"
 uuid = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
 authors = ["quinnj <[email protected]>"]
-version = "1.3.0"
+version = "1.4.0"
 
 [compat]
 julia = "1"

src/DataAPI.jl

@@ -121,7 +121,12 @@ Select the union of the selections in `cols`. If `cols == ()`, select all column
 """
 struct All{T<:Tuple}
     cols::T
-    All(args...) = new{typeof(args)}(args)
+    function All(args...)
+        if !isempty(args)
+            Base.depwarn("All(args...) is deprecated, use Cols(args...) instead", :All)
+        end
+        return new{typeof(args)}(args)
+    end
 end
 
 """