replace parallel-transform with pipeline-pipe

:wave: I did some awesome work for the Pelias project and would love for everyone to have a look at it and provide feedback.

Here's the reason for this change :rocket:

Hey, I've noticed that the adminLookup stream doesn't end with the end of pbf parser and found an [https://github.com/mafintosh/parallel-transform/issues/4](untucked issue in the parallel-transform module). Someone came up with the solution by creating new module pipeline-pipe with slightly different syntax, but solving the same problem. I've update dependency and tested with my local setup, I hope this would be helpful for you as well.

Here's what actually got changed :clap:

Replace parallel-transform dependency with pipeline-pipe and converted callback-based transform function inside lookupStream with promise-based.

Here's how others can test the changes :eyes:

Now, you can handle end of the stream in pelias-openstreetmap module:

// default import pipeline
streams.import = function () {
  streams
    .pbfParser()
    .pipe(streams.docConstructor())
    .pipe(streams.addressesWithoutStreet())
    .pipe(streams.tagMapper())
    .pipe(streams.addressExtractor())
    .pipe(streams.blacklistStream())
    .pipe(streams.categoryMapper(categoryDefaults))
    .pipe(streams.addendumMapper())
    .pipe(streams.popularityMapper())
    .pipe(streams.adminLookup())
    .on('end', () => console.log('ended'))
};

In my case I'm not using Elasticsearch (and pelias-dbclient) and import data into different source after extraction/mapping.

pelias / wof-admin-lookup