Travis-CI: updated to use xenial instead of the outdated trusty dist (contributed by Sebastiaan Couwenberg)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@74140 15284696-431f-4ddb-bdfa-cd5b030d7da7

.travis.yml

@@ -6,11 +6,11 @@ language: c
 matrix:
    include:
       - os: linux
-        dist: trusty
+        dist: xenial
         compiler: gcc
         sudo: required
       - os: linux
-        dist: trusty
+        dist: xenial
         compiler: clang
         sudo: required
 

.travis/linux.install.sh

@@ -26,10 +26,10 @@ sudo apt-get install --no-install-recommends \
     proj-bin \
     libreadline-dev \
     libsqlite3-dev \
-    libwxgtk2.8-dev \
+    libwxgtk3.0-dev \
     libxmu-dev \
     python \
-    python-wxgtk2.8 \
+    python-wxgtk3.0 \
     python-dev \
     unixodbc-dev \
     libnetcdf-dev   \
@@ -38,3 +38,4 @@ sudo apt-get install --no-install-recommends \
     libblas-dev \
     liblapack-dev \
     python-numpy
+