release 5.3.1

content/news/en/2021-03-31-knot-resolver-5.3.1.rst

+:title: Knot Resolver 5.3.1 released
+:slug: knot-resolver-5.3.1
+:date: 2021-03-31 17:00
+:lang: en
+
+Improvements
+------------
+- policy.STUB: try to avoid TCP (compared to 5.3.0; !1155)
+- validator: downgrade NSEC3 records with too many iterations (>150; !1160)
+- additional improvements to nameserver selection algorithm (!1154, !1150)
+
+Bugfixes
+--------
+- dnstap module: don't break request resolution on dnstap errors (!1147)
+- cache garbage collector: fix crashes introduced in 5.3.0 (!1153)
+- policy.TLS_FORWARD: better avoid dead addresses (#671, !1156)