Add instructions to run 'git submodule update' to get tests 21-24

in Unix/t/01_opts.t to pass.  Prepare for 1.72 release.

Author: AlDanial

cloc

@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 # cloc -- Count Lines of Code                  {{{1
-# Copyright (C) 2006-2016 Al Danial <[email protected]>
+# Copyright (C) 2006-2017 Al Danial <[email protected]>
 # First release August 2006
 #
 # Includes code from:
@@ -29,7 +29,7 @@
 # <http://www.gnu.org/licenses/gpl.txt>.
 #
 # 1}}}
-my $VERSION = "1.71";  # odd number == beta; even number == stable
+my $VERSION = "1.72";  # odd number == beta; even number == stable
 my $URL     = "github.com/AlDanial/cloc";  # 'https://' pushes header too wide
 require 5.006;
 # use modules                                  {{{1

tests/README

@@ -1,3 +1,13 @@
 To run the tests:
   cd ../Unix
   make test
+
+Tests 21 through 24 in t/01_opts.t exercise cloc's ability to work
+with git submodules (specifically, to ignore code in these).  If 
+you're working with a git repo clone you will need to update the
+submodule via
+  git submodule init
+  git submodule update
+issued within your cloc working directory to get the tests to pass.
+The submodule will populate the directory
+tests/inputs/issues/131/cloc_submodule_test/

tests/inputs/issues/131/README

@@ -0,0 +1,7 @@
+This directory contains inputs for tests 21 through 24 in cloc/Unix/t/01_opts.t 
+The tests exercise cloc's ability to work with git submodules (specifically, 
+to ignore code in these).  If you're working with a git repo clone you will 
+need to update the submodule via
+  git submodule init
+  git submodule update
+issued within your cloc working directory to get the tests to pass.