newest psycopg2 release removed the psycopg1 interface we used.

rouilj · rouilj · commit 1367a89d7fd1 · 2019-04-06T09:56:06.000-04:00
Pin library version to last one where psycopg1 existed.
diff --git a/.travis.yml b/.travis.yml
@@ -66,7 +66,8 @@ before_install:
 
 install:
   - pip install mysqlclient==1.3.13
-  - pip install gpg psycopg2 pytz whoosh
+  - pip install psycopg2==2.7.7
+  - pip install gpg pytz whoosh
   - pip install pytest-cov codecov
 
 before_script:
