fix: return dict to Event pool (#749)

Return dict to event pool in Array.Dict()

README.md

@@ -827,4 +827,4 @@ references to them from within any `MarshalZerologArray(a *Array)` callback (e.g
 own code as they will be cleared and returned to the pool after being buffered by a call to `Context.Array()` or `Event.Array()`.
 
 Any _dictionary_ `Event` returned from `Context.CreateDict()` or `Event.CreateDict()` **must not** be referenced after being
-buffered by a call to `Context.Dict()` or `Event.Dict()` as they will be cleared and returned to the pool.
+buffered by a call to `Array.Dict()`, `Context.Dict()`, or `Event.Dict()` as they will be cleared and returned to the pool.

array.go

@@ -265,6 +265,7 @@ func (a *Array) MACAddr(ha net.HardwareAddr) *Array {
 func (a *Array) Dict(dict *Event) *Array {
 	dict.buf = enc.AppendEndMarker(dict.buf)
 	a.buf = append(enc.AppendArrayDelim(a.buf), dict.buf...)
+	putEvent(dict)
 	return a
 }
 

event.go

@@ -180,11 +180,10 @@ func (e *Event) Fields(fields interface{}) *Event {
 // Dict adds the field key with a dict to the event context.
 // Use e.CreateDict() to create the dictionary.
 func (e *Event) Dict(key string, dict *Event) *Event {
-	if e == nil {
-		return e
+	if e != nil {
+		dict.buf = enc.AppendEndMarker(dict.buf)
+		e.buf = append(enc.AppendKey(e.buf, key), dict.buf...)
 	}
-	dict.buf = enc.AppendEndMarker(dict.buf)
-	e.buf = append(enc.AppendKey(e.buf, key), dict.buf...)
 	putEvent(dict)
 	return e
 }