Travis: Build downloads on Trusty

Dear future contributors, please update this in April 2019 when Trusty becomes EOL.

Keep extended testing and documentation upload on Xenial as it is easier there to install required dependencies and other nice perks.

Also don't allow Node 10 to fail anymore.

Author: Croydon

.travis.yml

@@ -1,4 +1,6 @@
-sudo: false
+sudo: true
+# update to Xenial in April 2019; Trusty will be EOL, Xenial new minimum supported OS version
+dist: trusty
 
 branches:
   only:
@@ -34,10 +36,12 @@ jobs:
   include:
     - stage: "Extended testing"
       os: linux
+      dist: xenial
       node_js: "8"
       env: TARGET_ARCH="x64" EXTENDED_TESTING="false"
     - stage: "Deploy documentation"
       os: linux
+      dist: xenial
       node_js: "8"
       env: TARGET_ARCH="x64" DEPLOY_DOCUMENTATION="true"