Release 2.1.0

• fix strict copying of buffers (611da45)
• Merge pull request #31 from fratzinger/master (aaaa1e9)
• update dependencies to latest (74bda15)
• Merge pull request #30 from planttheidea/dependabot/npm_and_yarn/websocket-extensions-0.1.4 (76d391c)
• add support for Blob (2471e75)
• Bump websocket-extensions from 0.1.3 to 0.1.4 (8206b04)
• Merge pull request #29 from planttheidea/dependabot/npm_and_yarn/acorn-6.4.1 (aed5353)
• Bump acorn from 6.3.0 to 6.4.1 (ddf00a3)
• Update CHANGELOG.md (4e16072)
• Update CHANGELOG.md (b9afe1b)