Update README.rst

Update for complete migration to STPSF

README.rst

@@ -22,12 +22,12 @@ WebbPSF: Simulated Point Spread Functions for the James Webb and Nancy Grace Rom
    :target: http://ascl.net/1504.007
 
 
-**ADVISORY: WebbPSF IS BEING MIGRATED TO A NEW REPOSITORY: STPSF (Space Telescope PSF)**
+**ADVISORY: WebbPSF HAS BEEN MIGRATED TO A NEW REPOSITORY: STPSF (Space Telescope PSF)**
 
    **To reflect its broader support for Roman as well as James Webb, WebbPSF is being migrated to a new repository: STPSF (Space Telescope PSF).**
    **This transition is being done in such a way as to maintain back-compatibility for existing code, and existing installations will continue to run as-is.**
-   **This transitional period is ongoing now. Please do not submit pull requests to this webbpsf repo at this time.**
-   **The STPSF github repository will soon be available for use instead.**
+   **This transitional period is now complete. Please do not submit pull requests to this webbpsf repo at this time.**
+   **The STPSF github repository can be found at https://github.com/spacetelescope/stpsf.**
 
 WebbPSF produces simulated PSFs for the James Webb Space Telescope, NASA's
 flagship infrared space telescope. WebbPSF can simulate images for any of the