requirements: Upgrade pip from 19.1 to 19.2.1.
requirements: Upgrade pip from 19.1 to 19.2.1.

andersk/zulip,timabbott/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,shubhamdhama/zulip,synicalsyntax/zulip,showell/zulip,eeshangarg/zulip,brainwane/zulip,punchagan/zulip,brainwane/zulip,tommyip/zulip,zulip/zulip,showell/zulip,shubhamdhama/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,rht/zulip,zulip/zulip,punchagan/zulip,timabbott/zulip,kou/zulip,showell/zulip,brainwane/zulip,tommyip/zulip,tommyip/zulip,shubhamdhama/zulip,showell/zulip,hackerkid/zulip,synicalsyntax/zulip,synicalsyntax/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,hackerkid/zulip,andersk/zulip,showell/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,eeshangarg/zulip,tommyip/zulip,eeshangarg/zulip,shubhamdhama/zulip,punchagan/zulip,eeshangarg/zulip,timabbott/zulip,brainwane/zulip,zulip/zulip,kou/zulip,synicalsyntax/zulip,andersk/zulip,synicalsyntax/zulip,punchagan/zulip,tommyip/zulip,hackerkid/zulip,rht/zulip,showell/zulip,tommyip/zulip,kou/zulip,synicalsyntax/zulip,punchagan/zulip,eeshangarg/zulip,showell/zulip,timabbott/zulip,eeshangarg/zulip,andersk/zulip,brainwane/zulip,rht/zulip,kou/zulip,punchagan/zulip,shubhamdhama/zulip,brainwane/zulip,zulip/zulip,timabbott/zulip,rht/zulip,rht/zulip,andersk/zulip,kou/zulip,synicalsyntax/zulip,rht/zulip,andersk/zulip,zulip/zulip,timabbott/zulip,tommyip/zulip