ReleaseNotes: skip 'Git for Windows' in the 'since <version>' part

We just added (Javascript) code to render the release notes in a
slightly more useful way: instead of stressing the _previous_ version in
the section headers, we stress the current version, appending "since
<previous-version>" in a smaller font.

This part is rendered smaller because it is not actually all that
important, and it is definitely not important to mention the project
name again...

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

render-release-notes.sh

@@ -110,7 +110,7 @@ render_release_notes () {
 					$v = "snapshot"
 				}
 
-				s/^<h2>Changes since(.*)/<h2>Changes in $v <small>since \1<\/small>/;
+				s/^<h2>Changes since (?:Git(?: for Windows|-))(.*)/<h2>Changes in $v <small>since \1<\/small>/;
 
 				if (!$latest) {
 					s/>[^<]*/><a name="latest"$&<\/a>/;