HLint ignoring rules improvements

.hlint.yaml

@@ -2,11 +2,17 @@
 - group: {name: generalise, enabled: true}
 - functions:
   - {name: undefined, within: []}
+# Do not prohibit using more monomorphic functions
 - ignore: {name: Use pure}
+- ignore: {name: Use fmap}
+- ignore: {name: Use traverse_}
+- ignore: {name: "Use <>"}
+# Do not enforce less explicit expressions
+# and util functions consisting of single line of code
+- ignore: {name: Use isNothing}
 - ignore: {name: Use print}
 - ignore: {name: Use null}
 - ignore: {name: Use notElem}
 - ignore: {name: Use unless}
-- ignore: {name: Use fmap}
-- ignore: {name: Use traverse_}
 - ignore: {name: "Use asks"}
+- ignore: {name: "Eta reduce"}