Update dependency rxjs to v7

Author: renovate[bot]

package.json

@@ -25,7 +25,7 @@
     "iconv": "^2.3.2",
     "iconv-lite": "^0.6.0",
     "node-html-parser": "^1.1.12",
-    "rxjs": "^6.3.3",
+    "rxjs": "^7.0.0",
     "ts-node": "^8.0.2"
   },
   "devDependencies": {