[FIX] Odoo 10.0-12.0: update wkhtmltopdf to recommended version

wkhtmltopdf 0.12.5 is now the recommended version.
This commiit uses the Debian packages that exist for Jessie and Stretch.

Fixes #220

10.0/Dockerfile

@@ -16,8 +16,8 @@ RUN set -x; \
             python-support \
             python-vobject \
             python-watchdog \
-        && curl -o wkhtmltox.deb -SL http://nightly.odoo.com/extra/wkhtmltox-0.12.1.2_linux-jessie-amd64.deb \
-        && echo '40e8b906de658a2221b15e4e8cd82565a47d7ee8 wkhtmltox.deb' | sha1sum -c - \
+        && curl -o wkhtmltox.deb -SL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.jessie_amd64.deb \
+        && echo '4d104ff338dc2d2083457b3b1e9baab8ddf14202 wkhtmltox.deb' | sha1sum -c - \
         && dpkg --force-depends -i wkhtmltox.deb \
         && apt-get -y install -f --no-install-recommends \
         && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false -o APT::AutoRemove::SuggestsImportant=false npm \