clib install fails: unable to fetch clibs/opencollective:package.json

~~~
$ clib install bpkg/bpkg
       fetch : bpkg/bpkg:package.json
       fetch : clibs/opencollective:package.json
       error : unable to fetch clibs/opencollective:package.json

$ zsh --version
zsh 5.7.1 (x86_64-apple-darwin18.2.0)

$ clib --version
1.8.1
~~~