Fix typo

Author: sookcha

src/malli/dev/virhe.cljc

@@ -185,7 +185,7 @@
 (defmethod -format ::default [e data printer]
   (if-let [-format #?(:clj (some (methods -format) (-hierarchy (class e))), :cljs nil)]
     (-format e data printer)
-    {:title "Uknown Error"
+    {:title "Unknown Error"
      :body [:group
             (-block "Type:" (-visit (type e) printer) printer) :break :break
             (-block "Message:" (-color :string (ex-message e) printer) printer)