update travis script to use redis 5.0.1

Author: fe2s

.travis.yml

@@ -3,10 +3,10 @@ language: scala
 scala:
     - 2.11.2
 install:
-    - wget http://download.redis.io/releases/redis-5.0.0.tar.gz
-    - tar -xzvf redis-5.0.0.tar.gz
-    - make -C redis-5.0.0 -j4
-    - export PATH=$PWD/redis-5.0.0/src:$PATH
+    - wget http://download.redis.io/releases/redis-5.0.1.tar.gz
+    - tar -xzvf redis-5.0.1.tar.gz
+    - make -C redis-5.0.1 -j4
+    - export PATH=$PWD/redis-5.0.1/src:$PATH
 script: make test
 cache:
     directories: