Removed unsupported versions

Author: mkoppanen

.travis.yml

@@ -8,8 +8,6 @@ env:
     - LIBMEMCACHED_VERSION=1.0.16
     - LIBMEMCACHED_VERSION=1.0.8
     - LIBMEMCACHED_VERSION=1.0.2
-    - LIBMEMCACHED_VERSION=0.53
-    - LIBMEMCACHED_VERSION=0.44
 
 before_script:
     - wget "https://launchpad.net/libmemcached/1.0/${LIBMEMCACHED_VERSION}/+download/libmemcached-${LIBMEMCACHED_VERSION}.tar.gz"