Fix perl binary path and bump minor version to v0.91

Change-Id: I5096d69b3cd52ad0f1b14ddb31582cc5c6cd1783
diff --git a/script/derekovecs-server b/script/derekovecs-server
index b09ffcf..9b969c7 100755
--- a/script/derekovecs-server
+++ b/script/derekovecs-server
@@ -1,5 +1,6 @@
-#!/usr/local/bin/perl
-our $VERSION = '0.90';
+#!/usr/bin/env perl
+
+our $VERSION = '0.91';
 
 use IDS::DeReKoVecs::Read;
 use Mojolicious::Lite;