Updated README.md for RC3

Author: donmendelson

README.md

@@ -14,7 +14,18 @@ Issues may be entered here in GitHub or in a discussion forum on the [FIX Tradin
 
 ## Versions
 
-### Current version: Release Candidate 2
+
+### Current version: Release Candidate 3
+Release Candidate 3 was approved by the Global Technical Committee on March 8, 2018 for 90 day public review. The key enhancements in Release Candidate 3 were:
+
+* The XML schema was simplified to support a single protocol version per file.
+* Scenarios were extended down to the component level as well as to messages. For example, different flavors of the Instrument block can be defined for different asset classes or for a full version versus a brief version.
+* Discriminator fields that modify the data domain of another field, such as SecurityIDSource and SecurityID, are now machine readable.
+* The schema now supports rendering hints to inform code generators and the like.
+* Facilities were added to define stable semantic concepts for which encoding changed between versions of FIX. For example, the Rule80A field in FIX 4.2 was replaced by OrderCapacity and OrderRestrictions fields.
+
+
+### Release Candidate 2
 Release Candidate 2 was approved by the Global Technical Committee on May 18, 2017 for 90 day public review. The themes for Release Candidate 2 were:
 * Completion of a DSL grammar for conditional expressions
 * FIXatdl integration
@@ -24,7 +35,7 @@ Release Candidate 2 was approved by the Global Technical Committee on May 18, 20
 Version 1.0 RC1 standardized the XML schema for FIX Orchestra and FIX Repository 2016 Edition. Release Candidate 1 was approved by the Global Technical Committee on Dec. 15, 2016 for 90 day public review. 
 
 ## License
-FIX Orchestra specifications are © Copyright 2016-2017 FIX Protocol Ltd. 
+FIX Orchestra specifications are © Copyright 2016-2018 FIX Protocol Ltd. 
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nd/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/Text" property="dct:title" rel="dct:type">FIX Orchestra Technical Specification</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="http://www.fixtradingcommunity.org/" property="cc:attributionName" rel="cc:attributionURL">FIX Protocol Ltd.</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/">Creative Commons Attribution-NoDerivatives 4.0 International License</a>.<br />Based on a work at <a xmlns:dct="http://purl.org/dc/terms/" href="https://github.com/FIXTradingCommunity/fix-orchestra-spec" rel="dct:source">https://github.com/FIXTradingCommunity/fix-orchestra-spec</a>.