exit the program if the config file wasn't found

also writes the cwd to the console.

evalbot.pl

@@ -36,6 +36,7 @@ =head1 AUTHOR
 use Carp qw(confess);
 use Data::Dumper;
 use FindBin;
+use Cwd;
 use lib 'lib';
 use EvalbotExecuter;
 use IRC::FromANSI::Tiny;
@@ -358,6 +359,10 @@ package main;
     exit 0;
 }
 
+unless (-e $config_file) {
+	confess("The given config file, $config_file, wasn't found in {getcwd}.");
+}
+
 my %conf = %{ Config::File::read_config_file($config_file) };
 
 #warn Dumper(\%conf);