diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0d93bdfc..f5540368 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,22 +5,20 @@ on: [push, pull_request]
 jobs:
   test:
     name: Test (Elixir ${{matrix.elixir}} | Erlang/OTP ${{matrix.otp}})
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-18.04
     strategy:
       fail-fast: false
       matrix:
         include:
           - otp: 24.0
             elixir: 1.12.1
-            lint: true
             integration: true
           - otp: 23.3
             elixir: 1.11.4
             lint: true
+            integration: true
           - otp: 23.3
             elixir: 1.10.4
-          - otp: 22.3
-            elixir: 1.10.4
           - otp: 22.3
             elixir: 1.9.4
     env:
@@ -37,12 +35,17 @@ jobs:
       - name: Install dependencies
         run: mix deps.get --only test
 
-      - name: Check no unused dependencies
+      - name: Check for unused dependencies
         run: mix deps.get && mix deps.unlock --check-unused
         if: ${{matrix.lint}}
 
-      - name: Compile dependencies
-        run: mix deps.compile
+      - name: Compile with --warnings-as-errors
+        run: mix compile --warnings-as-errors
+        if: ${{matrix.lint}}
+
+      - name: Check mix format
+        run: mix format --check-formatted
+        if: ${{matrix.lint}}
 
       - name: Run tests
         run: mix test --trace
diff --git a/lib/protobuf/protoc/generator/message.ex b/lib/protobuf/protoc/generator/message.ex
index 821bea1c..e42e9c20 100644
--- a/lib/protobuf/protoc/generator/message.ex
+++ b/lib/protobuf/protoc/generator/message.ex
@@ -115,7 +115,6 @@ defmodule Protobuf.Protoc.Generator.Message do
         {fmt_type_name(f.name, longest_width), "{atom, any}"}
       end)
 
-
     types =
       types ++
         Enum.map(fields, fn f ->