Updated converters/p5-JSON to 2.90

## JSON version 2.9 #####################################################

CAUTION!!!
INCOMPATIBLE CHANGE

JSON.pm had patched JSON::XS::Boolean and JSON::PP::Boolean internally
on loading time for making these modules inherit JSON::Boolean.
But since JSON::XS v3.0 it use Types::Serialiser as boolean class.
Then now JSON.pm breaks boolean classe overload features and
-support_by_pp if JSON::XS v3.0 or later is installed.

JSON::true and JSON::false returned JSON::Boolean objects.
For workaround, they return JSON::PP::Boolean objects in this version.

    isa_ok(JSON::true, 'JSON::PP::Boolean');

And it discards a feature:

    ok(JSON::true eq 'true');

In other word, JSON::PP::Boolean overload numeric only.

    ok( JSON::true == 1 );

##########################################################################

2.90  Wed Oct 30 19:48:43 2013

	**** Please see to the headline in this file. ****

	- workaround for JSON::XS version 3.0 or later installed case.

	  * the objects returned by JSON::true/false are JSON::PP::Boolean.
	  * they do not overload 'eq'.

	- changed test cases for this patch.

	   t/e02_bool.t
	   t/e03_bool2.t
	   t/x17_strange_overload.t
	   t/xe02_bool.t
	   t/xe03_bool2.t
	   t/xe12_boolean.t

	**** Please see to the headline in this file. ****

2.61  Thu Oct 17 19:38:55 2013
	- fixed return/or in _incr_parse
	  reported and patched by MAUKE, sprout and rjbs
	  https://rt.cpan.org/Public/Bug/Display.html?id=86948

2.60
	- $json->is_xs, $json->is_pp was completely broken.
	    pointed by rt#75867 and emceelam


(abs)