Add json-c to travis.

ahkok · ahkok · commit 71e0fc6cca69 · 2019-10-03T14:04:30.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -16,6 +16,7 @@ addons:
             - valgrind
             - autoconf
             - automake
+            - libjson-c-dev
 
 script:
     - ./configure && make && make distcheck
