fix package.json

Author: moizKachwala

package.json

@@ -68,7 +68,7 @@
     "gulp-concat": "^2.6.0",
     "gulp-nodemon": "^2.2.1",
     "gulp-sourcemaps": "^2.4.1",
-    "gulp-tslint": "^8.1.1",
+    "gulp-tslint": "^7.1.0",
     "gulp-typescript": "^3.0.1",
     "gulp-typings": "^2.0.4",
     "method-override": "^2.3.6",