Remove FFmpeg 3.2 from Travis matrix (#548)

Author: ferdnyc

.travis.yml

@@ -32,11 +32,6 @@ addons:
     - curl
 
 jobs:
-
-  # The FFmpeg 3.2 backport PPA has gone missing
-  allow_failures:
-    - name: "FFmpeg 3.2 GCC (Ubuntu 16.04 Xenial)"
-
   include:
     - name: "Coverage + FFmpeg 3.4 GCC (Ubuntu 18.04 Bionic)"
       env:
@@ -99,31 +94,6 @@ jobs:
           - libavresample-dev
           - libomp-dev
 
-    - name: "FFmpeg 3.2 GCC (Ubuntu 16.04 Xenial)"
-      env:
-        - BUILD_VERSION=ffmpeg32
-        - CMAKE_EXTRA_ARGS=""
-        - TEST_TARGET="os_test"
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources:
-          - sourceline: 'ppa:openshot.developers/libopenshot-daily'
-          - sourceline: 'ppa:jon-hedgerows/ffmpeg-backports'
-          packages:
-          - *p_common
-          - libavresample-dev
-          - libavcodec57
-          - libavdevice57
-          - libavfilter6
-          - libavformat57
-          - libavresample3
-          - libavutil55
-          - libpostproc54
-          - libswresample2
-          - libswscale4
-
     - name: "FFmpeg 2 GCC (Ubuntu 16.04 Xenial)"
       env:
         - BUILD_VERSION=ffmpeg2