1.1.0

CHANGES:

• Add Keccak256 module (ethereum padding) (@maxtori, @dinosaure, #118)
• Update README.md to include the documentation (@mimoo, @dinosaure, 65a5c12)
• Remove deprecated function from fmt library (@dinosaure, #121)
• NOTE: This version lost the support of OCaml 4.03 and OCaml 4.04.