Merge pull request #1678 from parrt/node-deadsnakes-setup

node, deadsnakes setup simplification

.travis.yml

@@ -55,6 +55,12 @@ matrix:
     - os: linux
       jdk: oraclejdk7
       env: TARGET=python3
+      addons:
+        apt:
+          sources:
+            - deadsnakes # source required so it finds the package definition below
+          packages:
+            - python3.5
     - os: linux
       jdk: oraclejdk7
       env: TARGET=javascript

.travis/before-install-linux-python3.sh

@@ -2,8 +2,4 @@
 
 set -euo pipefail
 
-sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
-sudo add-apt-repository ppa:fkrull/deadsnakes -y
-sudo apt-get update -qq
-sudo apt-get install -qq python3.5
 python3 --version