Supports iri-reference format validation.

[fdutton]

Resolves #765

[codecov-commenter]

Codecov Report

Merging #766 (f7c1cce) into master (e73d129) will increase coverage by 0.12%.
The diff coverage is 96.66%.

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@@             Coverage Diff              @@
##             master     #766      +/-   ##
============================================
+ Coverage     74.12%   74.24%   +0.12%     
- Complexity     1080     1087       +7     
============================================
  Files           111      115       +4     
  Lines          3837     3851      +14     
  Branches        742      742              
============================================
+ Hits           2844     2859      +15     
+ Misses          695      693       -2     
- Partials        298      299       +1     

Impacted Files	Coverage Δ
...va/com/networknt/schema/format/AbstractFormat.java	100.00% <ø> (+25.00%)	⬆️
...ava/com/networknt/schema/format/PatternFormat.java	75.00% <50.00%> (-25.00%)	⬇️
...main/java/com/networknt/schema/JsonMetaSchema.java	82.11% <100.00%> (+0.60%)	⬆️
...networknt/schema/format/AbstractRFC3339Format.java	100.00% <100.00%> (ø)
...om/networknt/schema/format/IriReferenceFormat.java	100.00% <100.00%> (ø)
...in/java/com/networknt/schema/format/UriFormat.java	100.00% <100.00%> (ø)
...om/networknt/schema/format/UriReferenceFormat.java	100.00% <100.00%> (ø)