fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are ignored:
- https://snyk.io/vuln/npm:qs:20170213

Latest report for spences10/twitter-bot-bootstrap:
https://snyk.io/test/github/spences10/twitter-bot-bootstrap

.snyk

@@ -0,0 +1,12 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.7.0
+# ignores vulnerabilities until expiry date; change duration by modifying expiry date
+ignore:
+  'npm:qs:20170213':
+    - twit > request > qs:
+        reason: None given
+        expires: '2017-04-05T14:12:40.489Z'
+    - unirest > request > qs:
+        reason: None given
+        expires: '2017-04-05T14:12:40.490Z'
+patch: {}

package.json

@@ -8,14 +8,18 @@
   },
   "scripts": {
     "start": "node index.js",
-    "test": "standard && node index.js"
+    "test": "standard && node index.js",
+    "snyk-protect": "snyk protect",
+    "prepublish": "npm run snyk-protect"
   },
   "author": "",
   "license": "MIT",
   "dependencies": {
     "dotenv": "^4.0.0",
     "twit": "^2.2.5",
     "unique-random-array": "^1.0.0",
-    "unirest": "^0.5.1"
-  }
+    "unirest": "^0.5.1",
+    "snyk": "^1.25.1"
+  },
+  "snyk": true
 }