Update our dependencies

.travis.yml

@@ -6,6 +6,21 @@ cache:
   directories:
   - $HOME/Library/Caches/Homebrew
 
+addons:
+  apt:
+    update: true
+    sources:
+    - sourceline: 'ppa:vshn/ghostscript'
+    - sourceline: 'ppa:heyarje/libav-11'
+    packages:
+    - ghostscript
+    - poppler-utils
+    - libavformat56
+    - libavcodec56
+    - libavutil54
+    - libffi-dev
+    - pngquant
+
 env:
   global:
     - secure: "hsf6MT+n2x3OiDM2fQyJZdV0/PWYmv81LdVqC6cfnHBE/8N3DloJRqQ7WfO14TxhiK9PEC7MpyCj0lSabUHEO7gSH6Vks6I1asoSkt8S9/bSMlhT4hei+pwVpeGEiU5xHVATNjY+D919VC3IFvc3XmjT74h/2SLhaZ+jhEmDggM="  # HOMEBREW_OCRMYPDF_TOKEN

.travis/Brewfile

@@ -2,12 +2,14 @@ brew 'python'
 
 brew 'ghostscript'
 brew 'jbig2dec'
+brew 'jbig2enc'
 brew 'leptonica'
 brew 'libffi'
 brew 'libtiff'
 brew 'libxml2'
 brew 'mupdf-tools'
 brew 'openjpeg'
+brew 'pngquant'
 brew 'qpdf'
 brew 'tesseract'
 brew 'unpaper'

.travis/linux_before_install.sh

@@ -3,17 +3,6 @@
 set -euo pipefail
 set -x
 
-sudo add-apt-repository ppa:vshn/ghostscript -y
-sudo add-apt-repository ppa:heyarje/libav-11 -y
-sudo apt-get update -qq
-sudo apt-get install -y \
-	ghostscript \
-	poppler-utils \
-	libavformat56 \
-	libavcodec56 \
-	libavutil54 \
-	libffi-dev
-
 sudo add-apt-repository ppa:alex-p/tesseract-ocr -y
 
 sudo apt-get update

setup.py

@@ -243,6 +243,7 @@ setup(
         'cffi >= 1.9.1',          # must be a setup and install requirement
         'defusedxml >= 0.5.0',    # pure Python, so track HEAD closely
         'img2pdf >= 0.2.4',       # pure Python, so track HEAD closely
+        'pikepdf',
         'Pillow >= 4.0.0, != 5.1.0 ; sys_platform == "darwin"',        
                                   # Pillow < 4 has BytesIO/TIFF bug w/img2pdf 0.2.3
                                   # block 5.1.0, broken wheels