Update references to parquet-mr in parquet-format's Readmes

[asfimport]

Reporter: Wei Guo Assignee: Wei Guo

Related issues:

• Upgrade parquet-java dev scripts to reflect rename from parquet-mr (is a clone of)

  PRs and other links:

• GitHub Pull Request #260

_{Note: This issue was originally created as PARQUET-2497. Please see the migration documentation for further details.}

[asfimport]

Micah Kornfield / @emkornfield: [~shangx@uber.com] @wgtmac  it doesn't look like I have permission to add [~Wayne Guo] as a contributor and assign it to them, could you add a contribor so Wei can get credit.  Thanks

[asfimport]

Gang Wu / @wgtmac: @emkornfield Just added. BTW, I have modified your role. Please check if you have the permission now.

[asfimport]

Micah Kornfield / @emkornfield: Thanks, I have access now, seems like my old gmail account had admin privileges but no my ASF one.