Fix compatibility of ArangoCursor#filter with Java 6

Author: mpv1989

ChangeLog.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+### Fixed
+
+- fixed compatibility of `ArangoCursor#filter` with Java 6
+
 ## [5.0.1] - 2018-09-25
 
 ### Fixed

pom.xml

@@ -121,19 +121,6 @@
 					<target>1.6</target>
 					<compilerArgument></compilerArgument>
 				</configuration>
-				<executions>
-					<execution>
-						<id>test-compile</id>
-						<phase>process-test-sources</phase>
-						<goals>
-							<goal>testCompile</goal>
-						</goals>
-						<configuration>
-							<source>1.6</source>
-							<target>1.7</target>
-						</configuration>
-					</execution>
-				</executions>
 			</plugin>
 
 			<plugin>

src/main/java/com/arangodb/internal/cursor/ArangoFilterIterator.java

@@ -66,4 +66,9 @@ public T next() {
 		next = null;
 		return tmp;
 	}
+
+	@Override
+	public void remove() {
+		throw new UnsupportedOperationException();
+	}
 }

src/main/java/com/arangodb/internal/cursor/ArangoMappingIterator.java

@@ -48,4 +48,9 @@ public T next() {
 		return mapper.apply(iterator.next());
 	}
 
+	@Override
+	public void remove() {
+		throw new UnsupportedOperationException();
+	}
+
 }