try creating a pg superuser as ourselves without a password

Author: anp

.travis.yml

@@ -13,7 +13,7 @@ services:
 language: rust
 env: |
   DATABASE_POOL_SIZE=5 \
-  DATABASE_URL=postgres://postgres@/rfcbot \
+  DATABASE_URL=postgres:///rfcbot \
   GITHUB_SCRAPE_INTERVAL=6000 \
   GITHUB_USER_AGENT=rfcbot-rs \
   GITHUB_WEBHOOK_SECRETS=none \
@@ -24,6 +24,7 @@ before_install:
   - cargo fmt --all -- --check
 install:
   - sudo systemctl start postgresql
+  - sudo -u postgres createuser --no-password --superuser $USER
   - cargo install diesel_cli --no-default-features --features postgres -Z install-upgrade
 before_script:
   - diesel setup