add a news entry

diff --git a/doc/news/changes/minor/20170808MatthiasMaier b/doc/news/changes/minor/20170808MatthiasMaier
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+++ b/doc/news/changes/minor/20170808MatthiasMaier
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+Changed: ConstraintMatrix::ConstraintLine is now a public member class
+definition.
+<br>
+(Matthias Maier, 2017/08/08)

diff --git a/doc/news/changes/minor/20170808MatthiasMaier-2 b/doc/news/changes/minor/20170808MatthiasMaier-2
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+Improved: ConstraintMatrix now has a member function
+ConstraintMatrix::get_lines() that returns a range object that allows
+iteration over all constraint entries.
+<br>
+(Matthias Maier, 2017/08/08)