namedotcom: follow CNAME

[ldez]

Related to alexzorin/certbot-dns-multi#15

How to test this PR?

1. You need Go
2. Checkout the PR:

   git clone https://github.com/ldez/lego.git
   cd lego
   git checkout fix/namedotcom-cname

3. Compile lego:
   • if you have make: make build
   • if you don't make make: go build -o dist/lego ./cmd/lego
4. Run the following command with your information (email, domain, credentials):

   NAMECOM_API_TOKEN=xxx \
   NAMECOM_USERNAME=xxx \
   ./dist/lego -m your_email@example.com --dns namedotcom -d '*.example.com' -d example.com -s https://acme-staging-v02.api.letsencrypt.org/directory run

   The wildcard domain is important
5. Before each run of the command, you should clean your local environment:

   rm -rf .lego

ping @landall

[ldez]

@landall any news?