Fix style error

Author: 0xgouda

internal/sinks/postgres.go

@@ -54,7 +54,7 @@ func NewWriterFromPostgresConn(ctx context.Context, conn db.PgxPoolIface, opts *
 			return err
 		}
 		if !isValidInterval {
-			return fmt.Errorf("Partition interval must be at least 1 hour, got: %s", opts.PartitionInterval)
+			return fmt.Errorf("partition interval must be at least 1 hour, got: %s", opts.PartitionInterval)
 		}
 
 		l.Info("initialising measurements database...")

internal/sinks/postgres_test.go

@@ -527,7 +527,7 @@ func TestPartitionIntervalValidation(t *testing.T) {
 	}
 
 	_, err = NewPostgresWriter(ctx, connStr, opts)
-	a.EqualError(err, "Partition interval must be at least 1 hour, got: 1 minute")
+	a.EqualError(err, "partition interval must be at least 1 hour, got: 1 minute")
 
 	opts.PartitionInterval = "not an interval"
 	_, err = NewPostgresWriter(ctx, connStr, opts)