Remove shebangs entirely from documentation

I don't think that copy/pasting directly from docs into a file and
expecting a shebang to allow for command line execution is a common
practice.

README.md

@@ -47,8 +47,6 @@ the following should start up Firefox for you:
 #### Locally
 
 ```perl
-#!/bin/env perl
-
 use strict;
 use warnings;
 use Selenium::Remote::Driver;

lib/Selenium/Remote/Mock/RemoteConnection.pm

@@ -191,7 +191,6 @@ mock responses to specific functions
 
 =head2 Record interactions
 
-    #!/bin/env perl
     use strict;
     use warnings;
     use Selenium::Remote::Driver;