fix drone testing

this commit fixes the drone testing with a postgres database

.drone.yml

@@ -1,10 +1,10 @@
 image: go1.2
 env:
   - GOPATH=/var/cache/drone
-  - PGSTORE_TEST_CONN="postgres://postgres@localhost:5432/testDb?sslmode=disable"
 services:
   - postgres
 script:
-  - createdb -h localhost -U postgres testDb
+  - export PGSTORE_TEST_CONN="postgres://postgres@127.0.0.1/test?sslmode=disable"
+  - psql -c 'create database test;' -U postgres -h 127.0.0.1
   - make
   - make test