Polish README.
Polish README.

Change-Id: I94495abd21d61d4cdd958d66185a6be2fa53def3
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1650
Reviewed-by: abdullah alamoudi <8b29c0bce7821e9306bf8c38be49a7391211e0a9@gmail.com>
Sonar-Qube: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>
BAD: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@fulliautomatix.ics.uci.edu>

ecarm002/incubator-asterixdb,apache/incubator-asterixdb,ecarm002/incubator-asterixdb,ecarm002/incubator-asterixdb,ecarm002/incubator-asterixdb,apache/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb,heriram/incubator-asterixdb,ecarm002/incubator-asterixdb,heriram/incubator-asterixdb,ty1er/incubator-asterixdb,heriram/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb,heriram/incubator-asterixdb,ty1er/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,apache/incubator-asterixdb,ecarm002/incubator-asterixdb,ty1er/incubator-asterixdb,ecarm002/incubator-asterixdb,ty1er/incubator-asterixdb,apache/incubator-asterixdb,heriram/incubator-asterixdb