Release 2.1.0

• fix: add release-it config (0b082be)
• Merge pull request #9 from bigchaindb/update-dependencies (9c25834)
• fix: add browser usage example (1d9de89)
• fix: lint (46fe419)
• fix: update lint dependencies and config (1966cbd)
• fix: update build dependencies and configs (3b2b0e3)
• fix: update lint config (8d7cc23)
• fix: update doc (ad63020)
• fix: update test and release dependencies (8df972d)
• Merge pull request #8 from bigchaindb/add-types-def (6378521)
• fix: remove static values initializer (526bc13)
• Merge pull request #7 from bigchaindb/add-types-def (028d98e)
• fix: replace new Buffer by Buffer.from (95d6e38)
• fix: improve prefix sha256 types (c282e32)
• fix: eslint conf (857de47)
• complete types definition (70bf13d)
• init types definition (16be83d)
• Merge pull request #5 from bigchaindb/fix-type (d25bdab)
• fix Ed25519Sha256.sign type (637dc04)