[pkg-go] rclone is marked for autoremoval from testing

[Debian testing autoremoval watch]

rclone 1.50.2-2 is marked for autoremoval from testing on 2020-05-05

It (build-)depends on packages with these RC bugs:
954524: golang-github-koofr-go-httpclient: FTBFS: dh_auto_test: error: cd obj-x86_64-linux-gnu && go test -vet=off -v -p 4 github.com/koofr/go-httpclient returned exit code 1
954683: golang-github-tinylib-msgp: FTBFS: src/golang.org/x/tools/internal/imports/mod.go:17:2: cannot find package "golang.org/x/mod/module"