fix: .snyk & package.json to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-450202

Author: snyk-bot

.snyk

@@ -0,0 +1,10 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.14.0
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  SNYK-JS-LODASH-450202:
+    - json-refs > lodash:
+        patched: '2020-01-10T06:22:00.438Z'
+    - json-refs > graphlib > lodash:
+        patched: '2020-01-10T06:22:00.438Z'

package.json

@@ -32,13 +32,16 @@
     "lit-element": "2.2.1",
     "lit-html": "1.0.0",
     "marked": "^0.8.0",
-    "swagger2openapi": "^5.3.2"
+    "swagger2openapi": "^5.3.2",
+    "snyk": "^1.277.3"
   },
   "scripts": {
     "build": "NODE_ENV=production webpack",
     "serve": "webpack-dev-server --mode=development",
     "lint": "./node_modules/eslint/bin/eslint.js ./src/**",
-    "lint-fix": "./node_modules/eslint/bin/eslint.js --fix ./src/**"
+    "lint-fix": "./node_modules/eslint/bin/eslint.js --fix ./src/**",
+    "snyk-protect": "snyk protect",
+    "prepare": "yarn run snyk-protect"
   },
   "devDependencies": {
     "@babel/core": "^7.7.7",
@@ -64,5 +67,6 @@
     "webpack-bundle-analyzer": "^3.6.0",
     "webpack-cli": "^3.3.10",
     "webpack-dev-server": "^3.10.1"
-  }
+  },
+  "snyk": true
 }