Add a changelog entry for modifications to Subscriptor class.

diff --git a/doc/news/changes/minor/20180715Jean-PaulPelteret b/doc/news/changes/minor/20180715Jean-PaulPelteret
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+Changed: The Subscriptor class has been made thread-safe, and its behavior in
+debug and release modes are now identical. Although this makes subscription and 
+un-subscription slightly more expensive in release mode, debugging should be
+easier overall.
+<br>
+(Jean-Paul Pelteret, 2018/07/15)