Merge pull request #39 from p1c2u/feature/validate-oneof-anyof-and-allof-with-discriminator-oas31

anyOf, oneOf and allOf discriminator for OAS31

Author: p1c2u

Diff for: openapi_schema_validator/validators.py

@@ -59,7 +59,10 @@
 BaseOAS31Validator = extend(
     Draft202012Validator,
     {
-        #  adjusted to OAS
+        # adjusted to OAS
+        u"allOf": oas_validators.allOf,
+        u"oneOf": oas_validators.oneOf,
+        u"anyOf": oas_validators.anyOf,
         u"description": oas_validators.not_implemented,
         u"format": oas_validators.format,
         # fixed OAS fields