Check to make sure there's a .env file

While i was testing this, i noticed that it ran right by the .env check,
even though i don't have a .env file at all. The script checks for a
_bad_ .env, but not a missing one.

Now it does

upgrade.php

@@ -55,6 +55,12 @@ echo "--------------------------------------------------------\n\n";
 
 // Check the .env looks ok
 $env = file('.env');
+if (! $env){
+    echo "\n!!!!!!!!!!!!!!!!!!!!!!!!!! .ENV FILE ERROR !!!!!!!!!!!!!!!!!!!!!!!!!!\n";
+    echo "Your .env file doesn't seem to exist in this directory or isn't readable! Please look into that.\n";
+    exit(1);
+}
+
 $env_good = '';
 $env_bad = '';