Fixing misleading privacy claim (#3127)

* Correcting an old, misleading claim

* Merge conflict

* Changing "confidential transactions" to "hidden amounts"

README.md

@@ -11,7 +11,7 @@
 Grin is an in-progress implementation of the Mimblewimble protocol. Many characteristics are still undefined but the following constitutes a first set of choices:
 
   * Clean and minimal implementation, and aiming to stay as such.
-  * Follows the Mimblewimble protocol, which provides great anonymity and scaling characteristics.
+  * Follows the Mimblewimble protocol, which provides hidden amounts and scaling advantages.
   * Cuckoo Cycle proof of work in two variants named Cuckaroo (ASIC-resistant) and Cuckatoo (ASIC-targeted).
   * Relatively fast block time: one minute.
   * Fixed block reward over time with a decreasing dilution.