dependency added for package jqr

As per "Configuration failed because libjq was not found.", libjq-dev is added

Author: serhatcevikel

.travis.yml

@@ -1,7 +1,8 @@
 before_install:
   - sudo add-apt-repository ppa:ubuntugis/ppa -y
   - sudo apt-get update -q
-  - sudo apt-get install -y libudunits2-dev proj-bin gdal-bin libgdal-dev libproj-dev libv8-dev
+  - sudo apt-get install -y libudunits2-dev proj-bin \
+  gdal-bin libgdal-dev libproj-dev libv8-dev libjq-dev
 
 language: R
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