Merge branch 'fix-elixir-v1.10' into 'develop'

Fix compatibility with Elixir v1.10

See merge request pleroma/pleroma!2153

test/runtime_test.exs

@@ -6,6 +6,6 @@ defmodule Pleroma.RuntimeTest do
   use ExUnit.Case, async: true
 
   test "it loads custom runtime modules" do
-    assert Code.ensure_compiled?(RuntimeModule)
+    assert {:module, RuntimeModule} == Code.ensure_compiled(RuntimeModule)
   end
 end

test/support/http_request_mock.ex

@@ -19,7 +19,7 @@ def request(
     else
       error ->
         with {:error, message} <- error do
-          Logger.warn(message)
+          Logger.warn(to_string(message))
         end
 
         {_, _r} = error