Verion number + release date in CHANGELOG.

Author: davexparker

CHANGELOG.txt

@@ -1,7 +1,7 @@
 This file contains details of the changes in each new version of PRISM.
 
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-Changes since version 4.4 (up-to-date wrt c0533b0b)
+Version 4.5 (first released 19/4/2019)
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 * New features
@@ -40,7 +40,6 @@ Changes since version 4.4 (up-to-date wrt c0533b0b)
   - Makefile targets/settings: test, testsecho, testsfull, TESTS_ARGS, source-jar
   - NG_MAINCLASS setting for running PRISM in Nailgun server mode (prism -ng)
 
-
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 Version 4.4 (first released 23/7/2017)
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