Update readme for new home in Hyperledger.
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+Plenum is the heart of the distributed ledger technology inside Hyperledger
+Indy. As such, it provides features somewhat similar in scope to those
+found in Fabric. However, it is special-purposed for use in an identity
+system, whereas Fabric is general purpose.
+
+You can log bugs against Plenum in [Hyperledger's Jira](https://jira.hyperledger.org); use
+project "INDY".
+
Plenum makes extensive use of coroutines and the async/await keywords in
Python, and as such, requires Python version 3.5.0 or later. Plenum also
depends on libsodium, an awesome crypto library. These need to be installed
