Update readme

README.md

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 This gem allows to observe database locks generated by a Rails application. By default, locks data is not persisted anywhere in the PostgreSQL logs, so the only way to monitor it is via analyzing the transient state of the `pg_locks` metadata table. `pg-locks-monitor` is a simple tool that makes this process quick to implement and adjust to each app's individual requirements.
 
+You can read [this blogpost](https://pawelurbanek.com/rails-postgresql-locks) for more detailed info on database locks in the Rails apps.
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 ## Usage
 
 `PgLocksMonitor` class provides a `snapshot!` method, which notifies selected channels about database locks that match configured criteria.
@@ -136,8 +138,6 @@ Here's a sample lock notification:
   },
 ```
 
-You can read [this blogpost](https://pawelurbanek.com/rails-postgresql-locks) for more detailed info on locks in the Rails apps.
-
 ## Background job config
 
 This gem is intended to be used via a recurring background job, but it is agnostic to the background job provider. Here's a sample Sidekiq implementation: