#86 - Polishing

Remove unused imports.

Original pull request: #86.

Author: mp911de

src/test/kotlin/org/springframework/data/r2dbc/function/RowsFetchSpecExtensionsTests.kt

@@ -23,7 +23,6 @@ import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.assertThatExceptionOfType
 import org.junit.Test
 import reactor.core.publisher.Mono
-import java.lang.NullPointerException
 
 /**
  * Unit tests for [RowsFetchSpec] extensions.