Merge pull request #388 from tiborvass/19.03-buildx-update

Merged with https://github.com/seemethere/unir
Upstream-commit: 5707b8da0ac2ef070ff4369ffb28e869e94bcb7a
Component: packaging

Author: docker-unir[bot]

components/packaging/plugins/buildx.installer

@@ -6,7 +6,7 @@ source "$(dirname "$0")/.common"
 PKG=github.com/docker/buildx
 GOPATH=$(go env GOPATH)
 REPO=https://${PKG}.git
-: "${BUILDX_COMMIT=v0.3.0}"
+: "${BUILDX_COMMIT=v0.3.1}"
 DEST=${GOPATH}/src/${PKG}
 
 build() {