[release] Update the top level README.md file to point to the 0.11.0 release.
[release] Update the top level README.md file to point to the 0.11.0 release.

ChristianNavolskyi/YCSB,cricket007/YCSB,brianfrankcooper/YCSB,jaemyoun/YCSB,brianfrankcooper/YCSB,jaemyoun/YCSB,ChristianNavolskyi/YCSB,zyguan/ycsb,cricket007/YCSB,brianfrankcooper/YCSB,jaemyoun/YCSB,madhurihn/YCSB_ToyDB,manolama/YCSB,manolama/YCSB,leschekhomann/YCSB,zyguan/ycsb,ChristianNavolskyi/YCSB,ChristianNavolskyi/YCSB,manolama/YCSB,jaemyoun/YCSB,brianfrankcooper/YCSB,leschekhomann/YCSB,cricket007/YCSB,madhurihn/YCSB_ToyDB,madhurihn/YCSB_ToyDB,zyguan/ycsb,cricket007/YCSB,madhurihn/YCSB_ToyDB,zyguan/ycsb,leschekhomann/YCSB,manolama/YCSB,leschekhomann/YCSB