Use cd instead of pushd, add maintenance note

The use of pushd is surprising because fish's alt-left and alt-right
don't use the dirstack; instead they use their own history.
pushd/popd/dirs is only for people used to these builtins.

See fish-shell/fish-shell#12166

Author: krobelus

README.md

@@ -1,5 +1,9 @@
 [![Build Status](https://travis-ci.org/jethrokuan/z.svg?branch=master)](https://travis-ci.org/jethrokuan/z)
 
+# Maintenance Note
+
+This package is looking for a new maintainer, let us know if you're interested.
+
 # Z
 
 **z** is a port of [z](https://github.com/rupa/z) for the [fish shell](https://fishshell.com).
@@ -8,7 +12,7 @@
 
 A _pure-fish_ port means **z** is _fast_ and _fish-friendly_, with tab-completions and lazy-loading. Top that off with great customizability and a small amount of added functionality.
 
-Originally written by [@jethrokuan](https://github.com/jethrokuan/), co-maintained with [@krobelus](https://github.com/krobelus).
+Originally written by [@jethrokuan](https://github.com/jethrokuan/).
 
 ## Installation
 

functions/__z.fish

@@ -169,6 +169,6 @@ function __z -d "Jump to a recent directory."
             echo "Not sure how to open file manager"; and return 1
         end
     else
-        pushd "$target"
+        cd "$target"
     end
 end