v2.8.0

The release fixes an issue with the handling of the Hadoop file system. Prior to 2.8.0, Parquet4s was closing the file system when it didn't need it anymore. However, as Hadoop caches file systems, when a program accessed HDFS again, the closed file system was retrieved. Of course, any operation on such a file system would fail.
Thanks to @flipp5b, the issue is fixed, and Parquet4s doesn't close file systems anymore.