- fix source url

- update to version 1.4
* Headline changes:
* CMYK rendering (mudraw PWG and PAM formats)
* TIFF viewer (with multi-page support).
* Added MuJS Javascript interpreter.
* MuJS is the default, V8 and JavaScriptCore are compile time
options.
* Javascript support has to be explicitly enabled with
pdf_enable_js.
* All viewers now have JavaScript enabled in the default
builds.
* Viewers:
* X11: Horizontal scroll wheel support.
* X11: Status bar display with warnings.
* Android: Digital signatures.
* iOS: Links, form filling, annotation editing, and javascript.
* iOS: Reflow mode.
* WinRT: Printing.
* WinRT: Improved zooming behaviour.
* Tools:
* mudraw: Banded rendering with -B /band-height/.
* mudraw: Select output format with -F /format/.
* mudraw: Write to stdout if you use '-' as the output file
name.
* mudraw: Add TGA output format.
* mudraw: Improved SVG output.
* mutool show: Write output to file instead of stdout with -o
/filename/.