Update JSON-PP to CPAN version 4.00

[DELTA]

4.00 2018-12-07
- production release

3.99_01 2018-12-03
- BACKWARD INCOMPATIBILITY:
As JSON::XS 4.0 changed its policy and enabled allow_nonref
by default, JSON::PP also enabled allow_nonref by default

- implement allow_tags that was introduced by JSON::XS 3.0
- add boolean_values that was introduced by JSON::XS 4.0
- allow literal tags in strings in relaxed mode, as JSON::XS 3.02 does
- allow PERL_JSON_PP_USE_B environmental variable to restore
old number detection behavior for compatibility
- various doc updates

1 files changed, 1 insertions, 1 deletions

diff --git a/META.json b/META.json
index 72d9c83e4e..307028656e 100644
--- a/META.json
+++ b/META.json
@@ -128,5 +128,5 @@
       }
    },
    "version" : "5.029008",
-   "x_serialization_backend" : "JSON::PP version 2.97001"
+   "x_serialization_backend" : "JSON::PP version 4.00"
 }