Update README.md

README.md

@@ -38,7 +38,7 @@
     - Dina
         - https://www.emeraldinno.com/
         - https://www.bostonglobe.com/2020/04/23/nation/tech-out-mit-may-allow-caregivers-monitor-coronavirus-patients-distance/
-    - ? Zach pulse oximeter
+    - Zach
         - https://gitlab.cba.mit.edu/pub/coronavirus/tracking/-/issues/42
     - David
         - https://www.crr.columbia.edu/research/using-power-light-preventing-airborne-spread-coronavirus-and-influenza-virus