Parquet Readme.md still points to release 1.7.0

[asfimport]

The section "Add Parquet as a dependency in Maven" in the Readme.md at https://github.com/apache/parquet-mr still points to version 1.7.0

Reporter: Luciano Resende

_{Note: This issue was originally created as PARQUET-375. Please see the migration documentation for further details.}

[asfimport]

Alex Levenson / @isnotinvain:
Issue resolved by pull request 260
#260