deps: Bump Golang to 1.15.2, golangci-lint to 1.31.0
deps: Bump Golang to 1.15.2, golangci-lint to 1.31.0

Signed-off-by: Chris Crone <0bd24f27efbdecb22ed8ee46cb16be12b5608d69@docker.com>

docker/compose,docker/compose,docker/compose