Remove pty.js dependency

webext/package-lock.json

@@ -8080,30 +8080,6 @@
       "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM=",
       "dev": true
     },
-    "pty.js": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/pty.js/-/pty.js-0.3.1.tgz",
-      "integrity": "sha1-gfW+0zLW5eeraFaI0boDc0ENUbU=",
-      "dev": true,
-      "requires": {
-        "extend": "1.2.1",
-        "nan": "2.3.5"
-      },
-      "dependencies": {
-        "extend": {
-          "version": "1.2.1",
-          "resolved": "https://registry.npmjs.org/extend/-/extend-1.2.1.tgz",
-          "integrity": "sha1-oPX9bPyDpf5J72mNYOyKYk3UV2w=",
-          "dev": true
-        },
-        "nan": {
-          "version": "2.3.5",
-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.3.5.tgz",
-          "integrity": "sha1-gioNwmYpDOTNOhIoLKPn42Rmigg=",
-          "dev": true
-        }
-      }
-    },
     "public-encrypt": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/public-encrypt/-/public-encrypt-4.0.2.tgz",

webext/package.json

@@ -19,7 +19,6 @@
     "eslint": "^5.1.0",
     "mocha": "^5.2.0",
     "prettier": "1.13.7",
-    "pty.js": "^0.3.1",
     "sinon": "^6.1.3",
     "strip-ansi": "^4.0.0",
     "web-ext": "^2.7.0",