PARQUET-663: Update README.md
PARQUET-663: Update README.md

Fix 404 links in documentation

Author: Nihed MBAREK <nihedmm@gmail.com>

Closes #350 from nihed/patch-1 and squashes the following commits:

4ebe950 [Nihed MBAREK] Update README.md

laurentgo/parquet-mr,winningsix/incubator-parquet-mr,rdblue/parquet-mr,saucam/incubator-parquet-mr,HyukjinKwon/parquet-mr,HyukjinKwon/parquet-mr-1,SaintBacchus/parquet-mr,SaintBacchus/parquet-mr,piyushnarang/parquet-mr,SinghAsDev/parquet-mr,apache/parquet-mr,SaintBacchus/parquet-mr,SinghAsDev/parquet-mr,saucam/incubator-parquet-mr,laurentgo/parquet-mr,HyukjinKwon/parquet-mr,piyushnarang/parquet-mr,HyukjinKwon/parquet-mr,saucam/incubator-parquet-mr,cchang738/parquet-mr,cchang738/parquet-mr,cchang738/parquet-mr,rdblue/parquet-mr,SinghAsDev/parquet-mr,winningsix/incubator-parquet-mr,HyukjinKwon/parquet-mr-1,piyushnarang/parquet-mr,apache/parquet-mr,HyukjinKwon/parquet-mr-1,winningsix/incubator-parquet-mr,laurentgo/parquet-mr,apache/parquet-mr,rdblue/parquet-mr