Remove elixir 1.3.x from the build matrix

What does this commit/MR/PR do ?

- Remove elixir 1.3.x from the build matrix
- Support for elixir 1.3 dropped

Why is this commit/MR/PR needed ?

- To indicate that elixir 1.3 or below is not supported

.travis.yml

@@ -28,23 +28,16 @@ jobs:
           --exclude='./_build' \
           --exec-args='--frail --rc-path ./.remarkrc'
 
-    - stage: markdown-lint
+    - stage: elixir-lint
       language: elixir
       elixir: 1.8
       otp_release: 21.2
       script:
         - mix format --check-formatted --dry-run
 
     - &test
-      stage: test-1.3
-      language: elixir
-      elixir: 1.3
-      otp_release: 19.2
-      script:
-        - mix test
-
-    - <<: *test
       stage: test-1.4
+      language: elixir
       elixir: 1.4
       otp_release: 19.2
 

CHANGELOG.md

@@ -17,6 +17,8 @@ a Repo module confusingly - [PR](https://github.com/stephenmoloney/scrivener_lis
     `use` statement when creating a `Repo` module as is required
     for Ecto 3+.
 
+-   Elixir 1.4+ is required for scrivener_ecto 2.x
+
 ## v1.0.1
 
 -   Cannot pass %Scrivener.Config.t into `Scrivener.Repo.paginate`. Change docs to reflect this.