Added details about update GitHub release notes

Author: nickgammon

how_to_release.txt

@@ -119,9 +119,12 @@ UPDATE RELEASE NOTES
 
 1. Change record for relnotes for this release to have today's date as release date
 
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+POST RELEASE NOTES TO GITHUB
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+1. On Github, go to the "tags" link and click on "Add release notes". Copy and paste the release notes into the appropriate box.
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+    https://github.com/nickgammon/mushclient/tags
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+    Note, for each note item the explanatory lines should be indented four spaces (tab twice) so that the bulleted points are numbered correctly. Put "```" symbols around any code examples.
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