Merge branch 'dev' into mercadopago-2020

Author: mandarvaze

.travis.yml

@@ -1,7 +1,7 @@
 language: elixir
 
 otp_release:
-  - 20.2
+  - 20.3
 before_install:
   - mix local.hex --force
   - mix local.rebar --force
@@ -17,10 +17,10 @@ after_script:
 
 matrix:
   include:
-  - elixir: "1.5.3"
+  - elixir: "1.6.5"
     script:
       - mix coveralls.json
-  - elixir: "1.6.5"
+  - elixir: "1.7.4"
 
 notifications:
   email: