fix(vulnerabilities): Fixed vulnerabilities and updated dependencies

fixed npm vulnerabilities and updated project dependencies, react-avatar-editor is still in beta version though

package.json change on abhir9/Egnature#2

Closes LoginRadius#2

package.json

@@ -4,11 +4,11 @@
   "description" : "Egnature is a email signature generator tool,which is open source and free to use",
   "private": true,
   "keywords" : ["email", "signature", "email-signature", "sign", "esign","opensource","lr","hacktoberfest","html","javascript","react","open-source","contributions-needed","hactoberfest2020"],
-    "dependencies": {
-    "react": "^16.11.0",
+  "dependencies": {
+    "react": "^16.13.1",
     "react-avatar-editor": "^12.0.0-beta.0",
-    "react-dom": "^16.11.0",
-    "react-dropzone": "^10.1.10",
+    "react-dom": "^16.13.1",
+    "react-dropzone": "^11.2.0",
     "react-scripts": "^3.4.3"
   },
   "scripts": {
@@ -27,7 +27,7 @@
       "not op_mini all"
     ],
     "development": [
-      "last 1 chrome version",
+      "last 1 chrome version",  
       "last 1 firefox version",
       "last 1 safari version"
     ]