fix travis (#341)

add hook::lexwrap to testdeps (#341)
also use #!/usr/bin/env perl instead of #!/usr/bin/perl


can't see a related change to perl5.30 that could cause this however

xt/00_local_prereq.t

@@ -1,4 +1,4 @@
-#!/usr/local/bin/perl -w
+#!/usr/bin/env perl
 # prereq.t - Test file for prerequesites for SNMP::Info
 # $Id$