fix: Sample/.snyk & Sample/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/npm:lodash:20180130

Sample/.snyk

@@ -0,0 +1,8 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.13.1
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  'npm:lodash:20180130':
+    - react-native > plist > xmlbuilder > lodash:
+        patched: '2018-11-06T03:22:28.064Z'

Sample/package.json

@@ -6,12 +6,16 @@
     "start": "expo start",
     "android": "expo start --android",
     "ios": "expo start --ios",
-    "eject": "expo eject"
+    "eject": "expo eject",
+    "snyk-protect": "snyk protect",
+    "prepare": "npm run snyk-protect"
   },
   "dependencies": {
     "expo": "^30.0.1",
     "react": "16.3.1",
     "react-native": "https://github.com/expo/react-native/archive/sdk-30.0.0.tar.gz",
-    "react-native-segmented-control-tab": "^3.3.1"
-  }
+    "react-native-segmented-control-tab": "^3.3.1",
+    "snyk": "^1.108.0"
+  },
+  "snyk": true
 }