Update Go from 1.13.4 to 1.13.6
Removes GO111MODULE=on
for Go 1.13+, which is by default on Go 1.13+, updating Go from 1.13.4 (!56 (merged)) to 1.13.6:
go1.13.5 (released 2019/12/04) includes fixes to the go command, the runtime, the linker, and the net/http package. See the Go 1.13.5 milestone on our issue tracker for details.
go1.13.6 (released 2020/01/09) includes fixes to the runtime and the net/http package. See the Go 1.13.6 milestone on our issue tracker for details.
Edited by Takuya Noguchi