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_perlcritic.t

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 # 00_local_perlcritic.t - Test file for PBP compliance for SNMP::Info
 # $Id$