Readd TarReader to flux-commands.md

Author: dr0i

metafacture-io/src/main/resources/flux-commands.properties

@@ -21,5 +21,5 @@ print org.metafacture.io.ObjectStdoutWriter
 write org.metafacture.io.ObjectWriter
 as-records org.metafacture.io.RecordReader
 open-resource org.metafacture.io.ResourceOpener
-open-tar org.metafacture.io.
+open-tar org.metafacture.io.TarReader
 open-sru org.metafacture.io.SruOpener