Update shippable.yml

Author: buildsample

shippable.yml

@@ -11,7 +11,7 @@ install:
 # Create a DB as part of before script to use it
 
 before_script:
-  - psql -c 'create database if not exists test;' -U postgres
+  - psql -c "create database IF NOT EXISTS test;" -U postgres
   - mkdir -p shippable/testresults
   - mkdir -p shippable/codecoverage