Cannot build parquet-tools as per instructions

If I follow https://github.com/nielsbasjes/parquet-mr/tree/master/parquet-tools

I.e. clone and run

```Java

cd parquet-tools && mvn clean package -Plocal
```

then I get

```Java

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Parquet Tools 1.9.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for org.apache.parquet:parquet-hadoop:jar:1.9.1-SNAPSHOT is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.846s
[INFO] Finished at: Tue Oct 10 10:36:37 UTC 2017
[INFO] Final Memory: 11M/483M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project parquet-tools: Could not resolve dependencies for project org.apache.parquet:parquet-tools:jar:1.9.1-SNAPSHOT: Failure to find org.apache.parquet:parquet-hadoop:jar:1.9.1-SNAPSHOT in http://repository.apache.org/snapshots was cached in the local repository, resolution will not be reattempted until the update interval of apache.snapshots has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
```

**Reporter**: [sam](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=sams) / @samthebest

_{**Note**: *This issue was originally created as [PARQUET-1129](https://issues.apache.org/jira/browse/PARQUET-1129). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Beginne im Verzeichnis parquet-tools, indem du den verlinkten Anweisungen folgst und `mvn clean package -Plocal` ausführst, um den Fehler bei der Auflösung der Abhängigkeiten zu reproduzieren. Untersuche die Build-Metadaten, die die Abhängigkeit `parquet-hadoop` 1.9.1-SNAPSHOT deklarieren, und verifiziere, dass der dokumentierte Build erfolgreich ohne den Fehler wegen des fehlenden Artefakts abgeschlossen wird.

Vom Indexierungsmodell aus dem Issue-Text verfasst.