Update travis config with native zstd lib package install directive

Gabriel Tincu · Gabriel Tincu · commit df40c770aaed · 2020-03-21T00:31:50.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -20,6 +20,7 @@ addons:
   apt:
     packages:
       - libsnappy-dev
+      - libzstd-dev
       - openjdk-8-jdk
 
 cache:
