Drop support for Elixir < 1.8 and add newer Elixir/OTP versions to CI

.travis.yml

@@ -1,16 +1,24 @@
 language: elixir
 matrix:
   include:
-    - otp_release: 20.0
-      elixir: 1.6
-    - otp_release: 22.0
-      elixir: 1.7
+    # TODO: temporarily disabled since the newest version of Hackney (used by excoveralls) doesn't seem to work with OTP 20 ("Compiling src/hackney_ssl.erl failed")
+    #    - otp_release: 20.0
+    #      elixir: 1.8
+    - otp_release: 21.0
+      elixir: 1.8
     - otp_release: 22.0
       elixir: 1.8
-    - otp_release: 21.0
-      elixir: 1.9
+    # TODO: temporarily disabled since the newest version of Hackney (used by excoveralls) doesn't seem to work with OTP 20 ("Compiling src/hackney_ssl.erl failed")
+    #    - otp_release: 20.0
+    #      elixir: 1.9
     - otp_release: 22.0
       elixir: 1.9
+    - otp_release: 21.0
+      elixir: 1.10
+    - otp_release: 22.0
+      elixir: 1.10
+    - otp_release: 23.0
+      elixir: 1.10
 sudo: false
 script:
   - MIX_ENV=test mix coveralls.travis

CHANGELOG.md

@@ -5,6 +5,14 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 [Keep a CHANGELOG](http://keepachangelog.com).
 
 
+## Unreleased
+
+This version just upgrades to RDF.ex 0.8. With that Elixir version < 1.8 are no longer supported.
+
+[Compare v0.3.0...HEAD](https://github.com/marcelotto/rdf-ex/compare/v0.3.0...HEAD)
+
+
+
 ## 0.3.0 - 2018-09-17
 
 No significant changes. Just some adoptions to work with RDF.ex 0.5. 

mix.exs

@@ -9,7 +9,7 @@ defmodule JSON.LD.Mixfile do
     [
       app: :json_ld,
       version: @version,
-      elixir: "~> 1.6",
+      elixir: "~> 1.8",
       build_embedded: Mix.env == :prod,
       start_permanent: Mix.env == :prod,
       deps: deps(),