Improve .travis.yml matrix

Author: ream88

.travis.yml

@@ -1,24 +1,65 @@
 language: elixir
-elixir:
-  - 1.10
-  - 1.9
-  - 1.8
-  - 1.7
-otp_release:
-  - 20.0
-  - 21.0
-  - 22.0
-sudo: false # to use faster container based build environment
+
 env:
   - MIX_ENV=test
+
 install:
   - mix do local.hex --force, local.rebar --force
-  - mix deps.get # need to explicitly get test deps, see mix.exs
+  - mix deps.get
   - mix compile
+
 script:
   - mix test
+
 # https://hexdocs.pm/elixir/compatibility-and-deprecations.html#compatibility-between-elixir-and-erlang-otp
-matrix:
-  exclude:
-    - otp_release: 20.0
-      elixir: 1.10
+jobs:
+  include:
+    # Elixir 1.7: 19-22
+    - elixir: "1.7"
+      otp_relase: "19.0"
+
+    - elixir: "1.7"
+      otp_relase: "20.0"
+
+    - elixir: "1.7"
+      otp_relase: "21.0"
+
+    - elixir: "1.7"
+      otp_relase: "22.0"
+
+    # Elixir 1.8: 20-22
+    - elixir: "1.8"
+      otp_relase: "20.0"
+
+    - elixir: "1.8"
+      otp_relase: "21.0"
+
+    - elixir: "1.8"
+      otp_relase: "22.0"
+
+    # Elixir 1.9: 20-22
+    - elixir: "1.9"
+      otp_relase: "20.0"
+
+    - elixir: "1.9"
+      otp_relase: "21.0"
+
+    - elixir: "1.9"
+      otp_relase: "22.0"
+
+    # Elixir 1.10: 21-22
+    - elixir: "1.10"
+      otp_relase: "21.0"
+
+    - elixir: "1.10"
+      otp_relase: "22.0"
+
+    # Elixir 1.11: 21-23
+    - elixir: "1.11"
+      otp_relase: "21.0"
+
+    - elixir: "1.11"
+      otp_relase: "22.0"
+
+    - elixir: "1.11"
+      otp_relase: "23.0"