docs: add bitszn state sync and snapshot provider info (#814) (#821)

(cherry picked from commit 6dad259)

Co-authored-by: sashap88 <sasha-panasenya@ya.ru>

networks/umee-1/README.md

@@ -7,13 +7,15 @@
 - https://www.theamsolutions.info/umee-state-sync
 - https://stakeangle.com/state-sync/umee
 - https://book.testnet.run/umee/state-sync
+- https://bitszn.com/snapshots.html
 
 ## Snapshot Providers (Quick Sync)
 
 - https://snapshots.stake2.me/umee
 - https://polkachu.com/tendermint_snapshots/umee
 - https://snapshots.weakhand.xyz/umee
 - http://singularity-services.xyz/umee
+- https://bitszn.com/snapshots.html
 
 ## Umee Archival Nodes