Skip heisentest on earlier OTP versions

Author: josevalim

test/ex_doc/language/elixir_test.exs

@@ -97,6 +97,7 @@ defmodule ExDoc.Language.ElixirTest do
       assert_unchanged("bar/1", current_module: AutolinkTest.Foo)
     end
 
+    @tag :otp24
     test "auto-imported function" do
       assert autolink_doc("+/2") ==
                ~m"[`+/2`](https://hexdocs.pm/elixir/Kernel.html#+/2)"
@@ -107,11 +108,8 @@ defmodule ExDoc.Language.ElixirTest do
       assert autolink_doc("for/1", apps: [:elixir]) ==
                ~m"[`for/1`](Kernel.SpecialForms.html#for/1)"
 
-      # TODO: Remove check once Elixir v1.12+ is required
-      if Version.match?(System.version(), ">= 1.12.0-rc.0") do
-        assert autolink_doc("..///3") ==
-                 ~m"[`..///3`](https://hexdocs.pm/elixir/Kernel.html#..///3)"
-      end
+      assert autolink_doc("..///3") ==
+               ~m"[`..///3`](https://hexdocs.pm/elixir/Kernel.html#..///3)"
     end
 
     test "elixir callback" do