Add tag for 1.15.3

library/rethinkdb

@@ -2,6 +2,7 @@
 
 1.15.1: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.1
 1.15.2: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.2
+1.15.3: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.3
 1.15: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.3
 1: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.3
 latest: git://github.com/stuartpb/rethinkdb-dockerfiles@8990b61b5881039e15049f3b73191e37ba640cff 1.15.3