update pydas to 0.2.26

Change-Id: Icc2052db9dab4d2ed53dee4e3c62a0a7af981bb3
update requests to v1.2.3

Change-Id: Ie305613b8c7e365dfbe794ca41f94056011e7276
update simplejson to v3.3.0

Change-Id: I7afbed848d08cb395a4a81b71fd495ec73d4efb9
Merge topic 'UpdateSubmodule' into master

842fe63c update simplejson to v3.3.0
eaf872d9 update requests to v1.2.3
9d33017a update pydas to 0.2.26