[beast] TRAVIS: remove yakkety builds (broken npm) and assert successful zesty builds

[Tim Janik <timj src gnome org>]

commit 341ed51af764cefc07a528d5a2fd3fdde33fe254
Author: Tim Janik <timj gnu org>
Date:   Sun Jul 16 01:27:26 2017 +0200

    TRAVIS: remove yakkety builds (broken npm) and assert successful zesty builds
    
    Signed-off-by: Tim Janik <timj gnu org>

 .travis.yml |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 4a30959..2abc75b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,11 +13,10 @@ env:
   # INTENT: gccbuild clangbuild package bintrayup
   matrix:
     - DIST="ubuntu:xenial"      INTENT="distcheck,gccbuild"
-    - DIST="ubuntu:yakkety"     INTENT="gccbuild"
+    - DIST="ubuntu:zesty"       INTENT="gccbuild"
     # test upcoming releases and get new compiler warnings
     - DIST="debian:jessie"      INTENT="gccbuild"
     - DIST="debian:stretch"     INTENT="gccbuild"
-    - DIST="ubuntu:zesty"       INTENT="gccbuild"
     - DIST="ubuntu:zesty"       INTENT="clangbuild"
     - DIST="debian:unstable"    INTENT="gccbuild"
     - DIST="debian:unstable"    INTENT="clangbuild"
@@ -25,7 +24,6 @@ matrix:
   allow_failures:
     - env: DIST="debian:jessie"      INTENT="gccbuild"
     - env: DIST="debian:stretch"     INTENT="gccbuild"
-    - env: DIST="ubuntu:zesty"       INTENT="gccbuild"
     - env: DIST="ubuntu:zesty"       INTENT="clangbuild"
     - env: DIST="debian:unstable"    INTENT="gccbuild"
     - env: DIST="debian:unstable"    INTENT="clangbuild"