Update changelogs for haddock-2.19.0.1 and haddock-library-1.5.0.1

CHANGES.md

+## Changes in version 2.19.0.1
+
+ * Support for linking unicode operators (#458)
+
+ * Hyperlinker: Fix file handle leak in (#763)
+
 ## Changes in version 2.19.0
 
  * Haddock now supports tables in documentation inspired by reSTs grid tables

haddock-library/CHANGES.md

+## Changes in version 1.5.0.1
+
+ * Support for parsing unicode operators (#458)
+
 ## Changes in version 1.5.0
 
  * Bifunctor, Bifoldable and Bitraversable instances for DocH and MetaDoc