Update build script to add maven stable releases repository;

Set 'intellij idea' code style

Author: aleh-zhloba

src/main/kotlin/io/github/azhloba/postgresql/messaging/pubsub/R2dbcPostgresPubSub.kt

@@ -219,21 +219,22 @@ class R2dbcPostgresPubSub(
         }
     }
 
-    private fun listenChannels(channels: Set<String>): Mono<Void> = { connectionRef.get() }.toMono()
-        .flatMap { connection ->
-            channels.toFlux()
-                .concatMap { channel ->
-                    connection.createStatement("LISTEN $channel").execute()
-                }
-                .then()
-        }
-        .doOnError { e ->
-            logger.error(
-                "Error during channel listen queries execution for channels: " +
-                    channels.joinToString(", "),
-                e
-            )
-        }
+    private fun listenChannels(channels: Set<String>): Mono<Void> =
+        { connectionRef.get() }.toMono()
+            .flatMap { connection ->
+                channels.toFlux()
+                    .concatMap { channel ->
+                        connection.createStatement("LISTEN $channel").execute()
+                    }
+                    .then()
+            }
+            .doOnError { e ->
+                logger.error(
+                    "Error during channel listen queries execution for channels: " +
+                        channels.joinToString(", "),
+                    e
+                )
+            }
 
     private fun notifyChannels(requests: Collection<NotificationRequest>): Mono<Void> =
         getConnection().flatMap { connection ->
@@ -263,8 +264,9 @@ class R2dbcPostgresPubSub(
         }
             .doOnError { e -> logger.error("${requests.size} notification has not been sent", e) }
 
-    private fun getConnection(): Mono<PostgresqlConnection> = { connectionRef.get() }.toMono()
-        .switchIfEmpty(NoActiveConnectionException().toMono())
+    private fun getConnection(): Mono<PostgresqlConnection> =
+        { connectionRef.get() }.toMono()
+            .switchIfEmpty(NoActiveConnectionException().toMono())
 
     // remove this reflection hack as soon as R2DBC connection interface explicitly provides process id
     private fun extractProcessId(connection: PostgresqlConnection): Int {