dev(changed patching from sed to patch-package)

[theghost1980]

Changes made to patching:

• change command "postinstall": "patch-package"
• installed patch-package, as dev dep
• made changes directly on /node_modules/@hiveio/dhive/lib/utils.js:
  • from: const cross_fetch_1 = require("cross-fetch");
  • to: const cross_fetch_1 = require("node-fetch");
• applied the patch, now this patch lives in root directory as patches -> npx patch-package @hiveio/dhive
• all tests working as usual.