Apply suggestion to src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java

src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java

@@ -112,7 +112,7 @@ class Sequences {
         combinedMap.values());
   }
 
-  static ArrayXySequence getFirstSequence(Collection<XySequence> xySequences) {
+  private static ArrayXySequence getFirstSequence(Collection<XySequence> xySequences) {
     // Safe covariant cast
     return (ArrayXySequence) xySequences.iterator().next();
   }