ZOOKEEPER-2880 Rename README.txt to README.md - fixed packaging
ZOOKEEPER-2880 Rename README.txt to README.md - fixed packaging

(cherry picked from commit 37e277162d567b55a07d1755f0b31c32e93c01a0)

Obsidian-StudiosInc/zookeeper,maoling/zookeeper,hanm/zookeeper,apache/zookeeper,ralgond/paxoskeeper,hanm/zookeeper,hanm/zookeeper,ralgond/paxoskeeper,maoling/zookeeper,apache/zookeeper,apache/zookeeper,Obsidian-StudiosInc/zookeeper,Obsidian-StudiosInc/zookeeper,hanm/zookeeper,arshadmohammad/zookeeper,Obsidian-StudiosInc/zookeeper,Obsidian-StudiosInc/zookeeper,hanm/zookeeper,arshadmohammad/zookeeper,Obsidian-StudiosInc/zookeeper,Obsidian-StudiosInc/zookeeper,apache/zookeeper,ralgond/paxoskeeper,apache/zookeeper,arshadmohammad/zookeeper,arshadmohammad/zookeeper,maoling/zookeeper,hanm/zookeeper,maoling/zookeeper,maoling/zookeeper,arshadmohammad/zookeeper,maoling/zookeeper,ralgond/paxoskeeper,arshadmohammad/zookeeper,ralgond/paxoskeeper,ralgond/paxoskeeper,ralgond/paxoskeeper,Obsidian-StudiosInc/zookeeper,hanm/zookeeper,hanm/zookeeper,Obsidian-StudiosInc/zookeeper,apache/zookeeper,maoling/zookeeper,maoling/zookeeper,apache/zookeeper,arshadmohammad/zookeeper,apache/zookeeper,ralgond/paxoskeeper,arshadmohammad/zookeeper,ralgond/paxoskeeper