message: config: bring back sqlite default database
  That became postgres in
  Fix
diff: @@ -58,9 +58,9 @@ SQLALCHEMY_TRACK_MODIFICATIONS = False
  SECRET_KEY = '\2\1thisismyscretkey\1\2\e\y\y\h' # noqa
  # The SQLAlchemy connection string.
  -# SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(DATA_DIR, 'superset.db')
  +SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(DATA_DIR, 'superset.db')
  # SQLALCHEMY_DATABASE_URI = 'mysql://myapp@localhost/myapp'
  -SQLALCHEMY_DATABASE_URI = 'postgresql://root:password@localhost/myapp'
  +# SQLALCHEMY_DATABASE_URI = 'postgresql://root:password@localhost/myapp'
  # In order to hook up a custom password store for all SQLACHEMY connections
  # implement a function that takes a single argument of type 'sqla.engine.url',
  