CI / Travis: add zsh syntax check

.travis.yml

@@ -2,7 +2,7 @@
 language: perl
 install:
   - sudo apt-get update
-  - sudo apt-get --no-install-recommends install devscripts python python3 ruby php5-cli gawk ksh pylint
+  - sudo apt-get --no-install-recommends install devscripts python python3 ruby php5-cli gawk ksh zsh pylint
   - sudo apt-get --no-install-recommends install pkg-config libdb-dev libvirt-dev libexpat-dev
   # - Munin/Plugin.pm is in "munin-node" on precise
   - sudo apt-get --no-install-recommends install munin-node

t/test.t

@@ -71,6 +71,14 @@ sub process_file {
             }
         );
     }
+    elsif ( $interpreter =~ m{/bin/zsh} ) {
+        run_check(
+            {   command     => [ 'zsh', '-n', $file ],
+                description => 'zsh syntax check',
+                filename    => $filename
+            }
+        );
+    }
     elsif ( $interpreter =~ m{bash} ) {
         run_check(
             {   command     => [ 'bash', '-n', $file ],