CI: bump Elixir version

Author: fhunleth

.circleci/config.yml

@@ -26,11 +26,11 @@ defaults: &defaults
   working_directory: ~/repo
 
 jobs:
-  build_elixir_1_10_otp_22:
+  build_elixir_1_11_otp_23:
     docker:
-      - image: erlang:22.3.2
+      - image: erlang:23.1.1
         environment:
-          ELIXIR_VERSION: 1.10.2-otp-22
+          ELIXIR_VERSION: 1.11.1-otp-23
           LC_ALL: C.UTF-8
     <<: *defaults
     steps:
@@ -54,6 +54,22 @@ jobs:
             - _build
             - deps
 
+  build_elixir_1_10_otp_23:
+    docker:
+      - image: erlang:23.1
+        environment:
+          ELIXIR_VERSION: 1.10.4-otp-22
+          LC_ALL: C.UTF-8
+    <<: *defaults
+    steps:
+      - checkout
+      - <<: *install_system_deps
+      - <<: *install_elixir
+      - <<: *install_hex_rebar
+      - run: mix deps.get
+      - run: mix compile
+      - run: mix test
+
   build_elixir_1_9_otp_22:
     docker:
       - image: erlang:22.2.8
@@ -99,13 +115,16 @@ jobs:
       - <<: *install_elixir
       - <<: *install_hex_rebar
       - run: mix deps.get
+      - run: mix compile
       - run: mix test
 
 workflows:
   version: 2
   build_test:
     jobs:
-      - build_elixir_1_10_otp_22:
+      - build_elixir_1_11_otp_23:
+          context: org-global
+      - build_elixir_1_10_otp_23:
           context: org-global
       - build_elixir_1_9_otp_22:
           context: org-global