Revert "Uplevel pty.js"

This reverts commit 22d1f42f.

Bash on Ubuntu errors out during launch using the newer version, reverting
so it can be investigated first.

npm-shrinkwrap.json

@@ -334,8 +334,8 @@
     },
     "pty.js": {
       "version": "0.3.0",
-      "from": "https://github.com/Tyriar/pty.js/tarball/7e394e332975e01681feafa012eba8441023ca3d",
-      "resolved": "https://github.com/Tyriar/pty.js/tarball/7e394e332975e01681feafa012eba8441023ca3d",
+      "from": "https://github.com/Tyriar/pty.js/tarball/c75c2dcb6dcad83b0cb3ef2ae42d0448fb912642",
+      "resolved": "https://github.com/Tyriar/pty.js/tarball/c75c2dcb6dcad83b0cb3ef2ae42d0448fb912642",
       "dependencies": {
         "extend": {
           "version": "1.2.1",

package.json

@@ -30,7 +30,7 @@
     "iconv-lite": "0.4.13",
     "minimist": "1.2.0",
     "native-keymap": "0.3.0",
-    "pty.js": "https://github.com/Tyriar/pty.js/tarball/7e394e332975e01681feafa012eba8441023ca3d",
+    "pty.js": "https://github.com/Tyriar/pty.js/tarball/c75c2dcb6dcad83b0cb3ef2ae42d0448fb912642",
     "semver": "4.3.6",
     "vscode-debugprotocol": "1.14.0",
     "vscode-textmate": "2.3.1",