fix: package.json, package-lock.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

Author: snyk-bot

.snyk

@@ -1,5 +1,5 @@
 # Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
-version: v1.14.1
+version: v1.19.0
 ignore: {}
 # patches apply the minimum changes required to fix a vulnerability
 patch:
@@ -16,3 +16,5 @@ patch:
         patched: '2020-04-30T21:22:11.242Z'
     - styled-components > @babel/traverse > @babel/helper-function-name > @babel/template > @babel/types > lodash:
         patched: '2020-04-30T21:22:11.242Z'
+    - snyk > snyk-nodejs-lockfile-parser > @yarnpkg/core > lodash:
+        patched: '2020-08-28T17:01:44.064Z'

package.json

@@ -76,7 +76,7 @@
     "react-dom": "16.13.1",
     "react-feather": "2.0.8",
     "showdown": "1.9.1",
-    "snyk": "1.386.0",
+    "snyk": "^1.386.0",
     "styled-components": "5.1.1",
     "uuid": "8.3.0"
   },