fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-HTTPSPROXYAGENT-469131

Author: snyk-bot

.snyk

@@ -0,0 +1,12 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.13.5
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  SNYK-JS-HTTPSPROXYAGENT-469131:
+    - lerna > @lerna/publish > @evocateur/pacote > make-fetch-happen > https-proxy-agent:
+        patched: '2019-10-06T02:44:46.366Z'
+    - lerna > @lerna/publish > @lerna/npm-dist-tag > @evocateur/npm-registry-fetch > make-fetch-happen > https-proxy-agent:
+        patched: '2019-10-06T02:44:46.366Z'
+    - lerna > @lerna/publish > @lerna/npm-publish > @evocateur/libnpmpublish > @evocateur/npm-registry-fetch > make-fetch-happen > https-proxy-agent:
+        patched: '2019-10-06T02:44:46.366Z'

package.json

@@ -47,9 +47,15 @@
     "underscore": "latest"
   },
   "dependencies": {
-    "lerna": "^3.16.2"
+    "lerna": "^3.16.2",
+    "snyk": "^1.231.0"
   },
   "engines": {
     "node": ">=10.16.0"
-  }
+  },
+  "scripts": {
+    "snyk-protect": "snyk protect",
+    "prepublish": "npm run snyk-protect"
+  },
+  "snyk": true
 }