LetsEncrypt-DNS 1.1.0

• Update Certbot to 0.16.0
• Update Lexicon to 2.1.10 (which includes the SoftLayer provider)

LetsEncrypt-DNS 1.0.1

• Include Lexicon 2.1.8, with GoDaddy DNS provider.

LetsEncrypt-DNS 1.0.0

Initial release, with functional Lexicon 2.1.7 + Certbot 0.15