Upgrade to xterm 2.8

jupyterlab/package.json

@@ -90,7 +90,7 @@
     "sanitize-html": "^1.14.1",
     "semver": "^5.3.0",
     "url-parse": "^1.1.8",
-    "xterm": "^2.6.0"
+    "xterm": "^2.8.0"
   },
   "devDependencies": {
     "css-loader": "^0.27.3",

packages/terminal/package.json

@@ -20,7 +20,7 @@
     "@phosphor/domutils": "^1.1.1",
     "@phosphor/messaging": "^1.2.1",
     "@phosphor/widgets": "^1.3.0",
-    "xterm": "^2.6.0"
+    "xterm": "^2.8.0"
   },
   "devDependencies": {
     "rimraf": "^2.5.2",