Remove suppression

Author: oryan-block

src/main/kotlin/graphql/kickstart/tools/util/BiMap.java

@@ -7,7 +7,7 @@
 
 import static java.util.Collections.unmodifiableMap;
 
-@SuppressWarnings({"NullableProblems", "SuspiciousMethodCalls"})
+@SuppressWarnings("SuspiciousMethodCalls")
 public class BiMap<K, V> implements Map<K, V> {
 
     private final Map<K, V> delegate;