fix(package): update xterm to version 3.10.1

Closes #309

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "uglify-es": "^3.0.28",
     "utf-8-validate": "^4.0.0",
     "winston": "^2.3.1",
-    "xterm": "^2.8.1",
+    "xterm": "^3.10.1",
     "zone.js": "0.8.18"
   }
 }