Welcome Uwe Schindler to the Lucene PMC

I'm pleased to announce that the Lucene PMC has voted to add Uwe Schindler to the PMC.  Uwe has been doing a lot
of work in Lucene and Solr, including several of the last releases in Lucene.

Please join me in extending congratulations to Uwe!

-Grant Ingersoll
PMC Chair