Add Martha Cryan to list of SSC members (jupyter#746)

Author: Zsailer

about.html

@@ -375,6 +375,12 @@
     linkedin: https://www.linkedin.com/in/sylvaincorlay/
     twitter_handle: SylvainCorlay
     subproject: Voilà
+  - name: Martha Cryan
+    photo: Martha_Cryan.jpg
+    affiliation: Mito
+    gh_handle: marthacryan
+    linkedin: https://www.linkedin.com/in/marthacryan/
+    subproject: DEI Working Group  
   - name: Itay Dafna
     photo: ItayDafna.jpg
     affiliation: Netflix