Update .travis.yml

Author: Chris Wiechmann

.travis.yml

@@ -9,7 +9,7 @@ env:
     - CACHE_DIR=$HOME/docker
     - APIM_DOCKER_IMAGE=docker-registry.demo.axway.com/swagger-promote/api-mgr-with-policies:7.7-20200130
     - CASSANDRA_DOCKER_IMAGE=cassandra:2.2.12
-    - CACHE_FILE_APIM=$CACHE_DIR/api-manager_7_7_20200130.cache.tar.gz
+    - CACHE_FILE_APIM=$CACHE_DIR/api-manager_7_7_20200130-1.cache.tar.gz
     - CACHE_FILE_CASSANDRA=$CACHE_DIR/cassandra_2_2_12.cache.tar.gz
     - counter=0