Forgot to change extension on file passed to tar command.

Author: rouilj

.travis.yml

@@ -16,7 +16,7 @@ addons:
 before_install:
   - cd /tmp
   - curl -s -O https://oligarchy.co.uk/xapian/1.2.16/xapian-bindings-1.2.16.tar.xz
-  - tar -Jxvf xapian-bindings-1.2.16.tar.gz
+  - tar -Jxvf xapian-bindings-1.2.16.tar.xz
   - cd xapian-bindings-1.2.16/
   - ./configure --prefix=$VIRTUAL_ENV --with-python && make && make install