Downgrade dialyxir

mix.exs

@@ -1,13 +1,13 @@
 defmodule ExAws.KMS.Mixfile do
   use Mix.Project
 
-  @version "2.2.0"
+  @version "2.3.0"
 
   def project do
     [
       app: :ex_aws_kms,
       version: @version,
-      elixir: "~> 1.5",
+      elixir: "~> 1.11",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       deps: deps(),
@@ -17,6 +17,9 @@ defmodule ExAws.KMS.Mixfile do
       docs: [
         source_ref: "v#{@version}",
         formatters: ["html", "epub"]
+      ],
+      dialyzer: [
+        plt_add_apps: [:mix, :hackney]
       ]
     ]
   end
@@ -45,7 +48,8 @@ defmodule ExAws.KMS.Mixfile do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      {:dialyxir, "~> 1.0", only: [:dev, :test], runtime: false},
+      # dialyxir 1.4.x requires Elixir ~> 1.12
+      {:dialyxir, "1.3.0", only: [:dev, :test], runtime: false},
       {:hackney, ">= 0.0.0", only: [:dev, :test]},
       {:poison, ">= 0.0.0", only: [:dev, :test]},
       {:ex_doc, "~> 0.22", only: :dev},

mix.lock

@@ -1,6 +1,6 @@
 %{
   "certifi": {:hex, :certifi, "2.12.0", "2d1cca2ec95f59643862af91f001478c9863c2ac9cb6e2f89780bfd8de987329", [:rebar3], [], "hexpm", "ee68d85df22e554040cdb4be100f33873ac6051387baf6a8f6ce82272340ff1c"},
-  "dialyxir": {:hex, :dialyxir, "1.4.1", "a22ed1e7bd3a3e3f197b68d806ef66acb61ee8f57b3ac85fc5d57354c5482a93", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "84b795d6d7796297cca5a3118444b80c7d94f7ce247d49886e7c291e1ae49801"},
+  "dialyxir": {:hex, :dialyxir, "1.3.0", "fd1672f0922b7648ff9ce7b1b26fcf0ef56dda964a459892ad15f6b4410b5284", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "00b2a4bcd6aa8db9dcb0b38c1225b7277dca9bc370b6438715667071a304696f"},
   "earmark": {:hex, :earmark, "1.4.4", "4821b8d05cda507189d51f2caeef370cf1e18ca5d7dfb7d31e9cafe6688106a4", [:mix], [], "hexpm", "1f93aba7340574847c0f609da787f0d79efcab51b044bb6e242cae5aca9d264d"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.37", "2ad73550e27c8946648b06905a57e4d454e4d7229c2dafa72a0348c99d8be5f7", [:mix], [], "hexpm", "6b19783f2802f039806f375610faa22da130b8edc21209d0bff47918bb48360e"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},