DEPRECATED: per-appender :middleware-fn

Why?
  Not actually much use to this in practice. In particular,
  the current implementation didn't support influence over
  :msg_ and :output_ vals through the modification of :vargs.

  Support could be added, but the impl. would need to be
  reasonably involved. The feature's utility just doesn't justify
  the cost necessary to do it right.

--

Note: per-appender :ns-whitelist, :ns-blacklist are unchanged.

README.md

@@ -143,7 +143,6 @@ This is the biggest win over Java logging IMO.
       :timestamp-opts  ; Optional override for inherited {:pattern _ :locale _ :timezone _} (clj only)
       :ns-whitelist    ; Optional, stacks with active config's whitelist
       :ns-blacklist    ; Optional, stacks with active config's blacklist
-      :middleware-fn   ; Optional, stacks with active config's middleware
       :fn              ; (fn [data]) -> side effects, with keys described below
 
     An appender's fn takes a single data map with keys:

src/taoensso/timbre.cljx

@@ -70,7 +70,6 @@
       :timestamp-opts  ; Optional override for inherited {:pattern _ :locale _ :timezone _} (clj only)
       :ns-whitelist    ; Optional, stacks with active config's whitelist
       :ns-blacklist    ; Optional, stacks with active config's blacklist
-      :middleware-fn   ; Optional, stacks with active config's middleware
       :fn              ; (fn [data]) -> side effects, with keys described below
 
     An appender's fn takes a single data map with keys:
@@ -468,7 +467,7 @@
 
                            ?data ; Final data prep before going to appender
                            (if-let [mfn (:middleware-fn appender)]
-                             (mfn data)
+                             (mfn data) ; Deprecated, undocumented
                              data)]
 
                        (when-let [data ?data] ; Not filtered by middleware