Allow two getLogger() entrypoints

src/logging.nim

@@ -116,8 +116,13 @@ proc setLogOutputFormat*(fmt: string) =
 ################################################################
 ## Create a new logger object.
 ##
-proc getLogger*(name: string; extra: varargs[KVPair]): Logger =
-    ## Return a logger object
+proc getLogger*(name: string): Logger =
+    ## Return a logger
+    new(result)
+    result.name = name
+
+proc getLogger*(name: string; extra: openarray[KVPair]): Logger =
+    ## Return a logger object with some extra stuff
     new(result)
     result.name = name
     result.extra.add(extra)