readme: Link to SO for PATH setup instructions

Author: djonas-noip

README.md

@@ -14,27 +14,16 @@ Install
 ```bash
 composer global require davidrjonas/composer-lock-diff:^1.0@dev
 
-# With zsh, do `rehash` to make it known to the shell.
+# With zsh, run `rehash` to make it known to the shell.
 
-# If `composer-lock-diff` is not found, make sure ~/.composer/vendor/bin is in your `$PATH` env variable.
-# You'll need to restart your shell if you make this change.
-echo 'PATH=$PATH:$HOME/.composer/vendor/bin' >> ~/.profile
+# try it
+composer-lock-diff --help
 ```
 
-Or just copy the 'composer-lock-diff' to `/usr/local/bin`.
+If `composer-lock-diff` is not found, make sure `~/.composer/vendor/bin` is in
+your `$PATH` env variable. For more information on how to do that see [this question on Stack Overflow][SO].
 
-### zsh
-
-If you're running zsh and you need to add `~/.composer/vendor/bin` to your
-PATH, use the command above but add the following to `.zprofile`. This will
-keep everything working in sh, bash, and zsh. See
-https://superuser.com/questions/187639/zsh-not-hitting-profile
-
-```
-emulate sh
-. ~/.profile
-emulate zsh
-```
+[SO]: https://stackoverflow.com/questions/25373188/laravel-installation-how-to-place-the-composer-vendor-bin-directory-in-your
 
 Usage
 =====