chore(package): update jasmine-core to version 2.8.0

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "gulp-eslint": "4.0.0",
     "gulp-git": "2.4.2",
     "gulp-jasmine": "2.4.2",
-    "jasmine-core": "2.7.0",
+    "jasmine-core": "2.8.0",
     "run-sequence": "2.1.0",
     "vinyl": "2.1.0"
   }