fix(bch-js): Bumping to v4.20.7

package.json

@@ -31,7 +31,7 @@
     "node": ">=10.15.1"
   },
   "dependencies": {
-    "@psf/bch-js": "^4.18.0",
+    "@psf/bch-js": "^4.20.7",
     "apidoc": "^0.26.0",
     "axios": "^0.21.1",
     "bitcore-lib-cash": "^8.23.1",

src/util/route-utils.js

@@ -175,6 +175,11 @@ class RouteUtils {
             msg: '429 Too Many Requests',
             status: 429
           }
+        } else if (err.error.includes('Network error:')) {
+          return {
+            msg: err.error,
+            status: 503
+          }
         }
       }