Fixes to makefile.pl to ensure easy install of dependencies with cpanminus. wording update in readme

Makefile.PL

@@ -2,13 +2,11 @@ use ExtUtils::MakeMaker;
 
 WriteMakefile(
     NAME          => 'pshell',
-    VERSION_FROM  => 'lib/History/SQLite.pm',
     PREREQ_PM     => {
         'DBI'               => 0,
         'DBD::SQLite'       => 0,
         'Term::ReadLine'    => 0,
         'Cwd'               => 0,
         'File::HomeDir'     => 0,
-        'Environment::SQLite' => 0,
     },
 );

README.md

@@ -13,8 +13,8 @@ No job control, but that is what programs like tmux are for anyway. Fairly, basi
 - Term::ReadLine
 - Cwd
 - File::HomeDir
-- Environment::SQLite (for environment variables, part of the source)
-- History::SQLite (for command history, part of the source)
+- Environment::SQLite (for environment variables, part of the source, listed for completeness)
+- History::SQLite (for command history, part of the source, listed for completeness)
 
 If they are not marked as part of the source for the shell, you will need to install them manually. Via cpan or your package manager.