Added a changelog

diff --git a/doc/news/changes/minor/20201101Jean-PaulPelteret b/doc/news/changes/minor/20201101Jean-PaulPelteret
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+Fixed: There was a bug in 
+Differentiation::AD::ScalarFunction::extract_hessian_component()
+that was triggered when using a symmetric tensor extractor with a non-zero
+first component index. Having previously lead to either incorrect results being
+returned or valid user programs crashing, it has now been corrected.
+<br>
+(Jean-Paul Pelteret, 2020/11/01)
+