increment $VERSION after 0.020 release

Author: karenetheridge

Changes

@@ -1,5 +1,7 @@
 Revision history for JSON-Schema-Tiny
 
+{{$NEXT}}
+
 0.020     2023-04-12 03:28:28Z
          - update test results and exemptions for TJSA 1.019
 

lib/JSON/Schema/Tiny.pm

@@ -4,7 +4,7 @@ package JSON::Schema::Tiny;
 # ABSTRACT: Validate data against a schema, minimally
 # KEYWORDS: JSON Schema data validation structure specification tiny
 
-our $VERSION = '0.020';
+our $VERSION = '0.021';
 
 use 5.020;  # for unicode_strings, signatures, postderef features
 use experimental 0.026 qw(signatures postderef args_array_with_signatures);