message: Add escape-string-regexp dep
diff: "dependencies": {
  "bluebird": "^3.1.1",
  "crc": "^3.2.1",
  + "escape-string-regexp": "^1.0.5",
  "extend": "^2.0.0",
  "irc": "matrix-org/node-irc#b1614bc784200c65247784d7b9e9ab867140412d",
  "js-yaml": "^3.2.7",
  