fix typo in travis

Author: saghm

.travis.yml

@@ -6,7 +6,7 @@ before_install:
     - mv mongodb-linux-x86_64-3.0.10 3.0.10
     - wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.2.4.tgz
     - tar xvf mongodb-linux-x86_64-3.2.4.tgz
-    - mv mongodb-linux-x86_64-3.2.0 3.2.4
+    - mv mongodb-linux-x86_64-3.2.4 3.2.4
 
 env:
     - RUST_TEST_THREADS=1