pin back sqlalchemy and alembic

test_searching.py:test_subject_search
test_searching.py:test_computed_fields failed with sqlalchemy>=1.3
alembic was pinned back so pipenv could resolve dependencies

Author: klimburg

Pipfile

@@ -11,10 +11,10 @@ Flask-Migrate = ">=1.3.0"
 Flask-RESTful = "*"
 Flask-SQLAlchemy = ">=2.2"
 Flask-Security = ">=3.0.0"
-SQLAlchemy = ">=1.1.0"
+SQLAlchemy = ">=1.1.0,<1.3"
 URLObject = "*"
 Werkzeug = ">=0.10.2"
-alembic = ">=0.7.3"
+alembic = ">=0.7.3,<1.3"
 celery = {extras = ["redis"], version = "<5.0.0"}
 click = "<9"
 dateparser = "*"