make ecto optional

lib/uuid5.ex

@@ -1,10 +1,12 @@
 defmodule UUID5 do
-
   @moduledoc """
   An Ecto type for UUIDs v5 strings.
   """
 
-  @behaviour Ecto.Type
+  if Code.ensure_loaded?(Ecto.Type) do
+    @behaviour Ecto.Type
+  end
+
   @type t :: <<_::288>>
 
   @doc """
@@ -42,7 +44,7 @@ defmodule UUID5 do
     raise "trying to load string UUID as Ecto.UUID: #{inspect string}. " <>
           "Maybe you wanted to declare :uuid as your database field?"
   end
-  def load(%Ecto.Query.Tagged{type: :uuid5, value: uuid}) do
+  def load(%{__struct__: Ecto.Query.Tagged, type: :uuid5, value: uuid}) do
     {:ok, UUID.binary_to_string!(uuid)}
   end
   def load(_), do: :error

mix.exs

@@ -25,7 +25,7 @@ defmodule UUID5.Mixfile do
   # List of dependencies.
   defp deps do
     [{:uuid, "~> 1.1"},
-     {:ecto, "~> 2.0"},
+     {:ecto, "~> 2.0 or ~> 3.0", optional: true},
      {:ex_doc, ">= 0.0.0", only: :dev}]
   end
 

mix.lock

@@ -1,6 +1,11 @@
-%{"decimal": {:hex, :decimal, "1.1.2", "79a769d4657b2d537b51ef3c02d29ab7141d2b486b516c109642d453ee08e00c", [:mix], []},
-  "earmark": {:hex, :earmark, "1.0.1", "2c2cd903bfdc3de3f189bd9a8d4569a075b88a8981ded9a0d95672f6e2b63141", [:mix], []},
-  "ecto": {:hex, :ecto, "2.0.4", "03fd3b9aa508b1383eb38c00ac389953ed22af53811aa2e504975a3e814a8d97", [:mix], [{:db_connection, "~> 1.0-rc.2", [hex: :db_connection, optional: true]}, {:decimal, "~> 1.0", [hex: :decimal, optional: false]}, {:mariaex, "~> 0.7.7", [hex: :mariaex, optional: true]}, {:poison, "~> 1.5 or ~> 2.0", [hex: :poison, optional: true]}, {:poolboy, "~> 1.5", [hex: :poolboy, optional: false]}, {:postgrex, "~> 0.11.2", [hex: :postgrex, optional: true]}, {:sbroker, "~> 1.0-beta", [hex: :sbroker, optional: true]}]},
-  "ex_doc": {:hex, :ex_doc, "0.13.0", "aa2f8fe4c6136a2f7cfc0a7e06805f82530e91df00e2bff4b4362002b43ada65", [:mix], [{:earmark, "~> 1.0", [hex: :earmark, optional: false]}]},
+%{
+  "decimal": {:hex, :decimal, "1.6.0", "bfd84d90ff966e1f5d4370bdd3943432d8f65f07d3bab48001aebd7030590dcc", [:mix], [], "hexpm"},
+  "earmark": {:hex, :earmark, "1.3.0", "17f0c38eaafb4800f746b457313af4b2442a8c2405b49c645768680f900be603", [:mix], [], "hexpm"},
+  "ecto": {:hex, :ecto, "3.0.5", "bf9329b56f781a67fdb19e92e6d9ed79c5c8b31d41653b79dafb7ceddfbe87e0", [:mix], [{:decimal, "~> 1.6", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: true]}], "hexpm"},
+  "ex_doc": {:hex, :ex_doc, "0.19.1", "519bb9c19526ca51d326c060cb1778d4a9056b190086a8c6c115828eaccea6cf", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.7", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
+  "makeup": {:hex, :makeup, "0.5.6", "da47b331b1fe0a5f0380cc3a6967200eac5e1daaa9c6bff4b0310b3fcc12b98f", [:mix], [{:nimble_parsec, "~> 0.4.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm"},
+  "makeup_elixir": {:hex, :makeup_elixir, "0.10.0", "0f09c2ddf352887a956d84f8f7e702111122ca32fbbc84c2f0569b8b65cbf7fa", [:mix], [{:makeup, "~> 0.5.5", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm"},
+  "nimble_parsec": {:hex, :nimble_parsec, "0.4.0", "ee261bb53214943679422be70f1658fff573c5d0b0a1ecd0f18738944f818efe", [:mix], [], "hexpm"},
   "poolboy": {:hex, :poolboy, "1.5.1", "6b46163901cfd0a1b43d692657ed9d7e599853b3b21b95ae5ae0a777cf9b6ca8", [:rebar], []},
-  "uuid": {:hex, :uuid, "1.1.4", "36c7734e4c8e357f2f67ba57fb61799d60c20a7f817b104896cca64b857e3686", [:mix], []}}
+  "uuid": {:hex, :uuid, "1.1.8", "e22fc04499de0de3ed1116b770c7737779f226ceefa0badb3592e64d5cfb4eb9", [:mix], [], "hexpm"},
+}