Pin node-pty to 0.7.6

package.json

@@ -30,7 +30,7 @@
     "jsdoc": "3.4.3",
     "jsdom": "^11.11.0",
     "merge-stream": "^1.0.1",
-    "node-pty": "^0.7.2",
+    "node-pty": "0.7.6",
     "nodemon": "1.10.2",
     "npm-run-all": "^4.1.2",
     "nyc": "^11.8.0",

src/Terminal.integration.ts

@@ -88,7 +88,7 @@ if (os.platform() !== 'win32') {
   /** some helpers for pty interaction */
   // we need a pty in between to get the termios decorations
   // for the basic test cases a raw pty device is enough
-  primitivePty = pty.native.open(cols, rows);
+  primitivePty = (<any>pty).native.open(cols, rows);
 
   /** tests */
   describe('xterm output comparison', () => {