travis: remove 3.4 support, use dmenv 0.14

Author: dmerejkowsky

.travis.yml

@@ -3,15 +3,14 @@ sudo: false
 
 matrix:
   include:
-    - python: "3.4"
     - python: "3.5"
     - python: "3.6"
     - python: "3.7"
       dist: xenial
       sudo: true
 
 install:
-  - curl -L https://github.com/TankerHQ/dmenv/releases/download/v0.5.0/dmenv-linux -o dmenv
+  - curl -L https://github.com/TankerHQ/dmenv/releases/download/v0.14.0/dmenv-linux -o dmenv
   - chmod u+x dmenv
   - ./dmenv install