update to docstring

Author: jtsodapop

.github/workflows/python-package.yml

@@ -69,6 +69,7 @@ jobs:
       - name: mypy
         run: |
           pip install mypy==0.931
+          mypy --install-types
           mypy -p labelbox --pretty --show-error-codes
       - name: Install package and test dependencies
         run: |

labelbox/schema/project.py

@@ -248,7 +248,10 @@ def export_labels(self, download=False, timeout_seconds=600, **kwargs):
         Will only generate a new URL at a max frequency of 30 min.
 
         Args:
+            download (bool): Returns the url if False
             timeout_seconds (float): Max waiting time, in seconds.
+            start (str): Earliest date for labels, formatted "YYYY-MM-DD"
+            end (str): Latest date for labels, formatted "YYYY-MM-DD"
         Returns:
             URL of the data file with this Project's labels. If the server didn't
             generate during the `timeout_seconds` period, None is returned.