Update dependency start-server-and-test to v1.15.4

Author: renovate[bot]

package.json

@@ -116,7 +116,7 @@
     "pretty-format": "22.4.3",
     "progress-bar-webpack-plugin": "1.11.0",
     "react-test-renderer": "16.2.0",
-    "start-server-and-test": "1.1.0",
+    "start-server-and-test": "1.15.4",
     "ts-jest": "22.4.4",
     "ts-loader": "3.5.0",
     "ts-node": "5.0.1",