Set release date in notes

Author: jonesde

ReleaseNotes.txt

@@ -2,7 +2,7 @@
 Mantle Business Artifacts - Universal Data Model Release Notes
 
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-Release 2.1.0 - Not Yet Released
+Release 2.1.0 - 29 Nov 2018
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 Mantle Universal Data Model 2.1.0 is a minor new feature and bug fix