Travis: Use declarative APT for Tesseract too

.travis.yml

@@ -10,16 +10,21 @@ addons:
   apt:
     update: true
     sources:
-    - sourceline: 'ppa:vshn/ghostscript'
+    - sourceline: 'ppa:alex-p/tesseract-ocr'
     - sourceline: 'ppa:heyarje/libav-11'
+    - sourceline: 'ppa:vshn/ghostscript'
     packages:
     - ghostscript
-    - poppler-utils
-    - libavformat56
     - libavcodec56
+    - libavformat56
     - libavutil54
     - libffi-dev
     - pngquant
+    - poppler-utils
+    - tesseract-ocr
+    - tesseract-ocr-deu
+    - tesseract-ocr-eng
+    - tesseract-ocr-fra
 
 env:
   global:

.travis/linux_before_install.sh

@@ -3,16 +3,6 @@
 set -euo pipefail
 set -x
 
-sudo add-apt-repository ppa:alex-p/tesseract-ocr -y
-
-sudo apt-get update
-sudo apt-get autoremove -y
-sudo apt-get install -y --no-install-recommends \
-		tesseract-ocr \
-		tesseract-ocr-eng \
-		tesseract-ocr-fra \
-		tesseract-ocr-deu
-
 pip install --upgrade pip
 mkdir -p packages
 wget -q 'https://www.dropbox.com/s/vaq0kbwi6e6au80/unpaper_6.1-1.deb?raw=1' -O packages/unpaper_6.1-1.deb