update changelog for PR 259.
+ * Certificate/keys pairs are verified as matching before a renewal is accepted
+ as successful or a staged renewal is replacing the existing certificates.
+ This avoid potential mess ups in the md store file system to render the active
+ certificates non-working. [@mkauf]
+
v2.4.4
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* Domain names in `<MDomain ...>` can now appear in quoted form. Fixes #257
