lib/validators.rb in cqm-validators-3.1.1 vs lib/validators.rb in cqm-validators-3.1.2

@@ -6,9 +6,10 @@
 require_relative 'schematron_validator'
 require_relative 'measure_validator'
 require_relative 'data_validator'
 require_relative 'performance_rate_validator'
 require_relative 'qrda_qdm_template_validator'
+require 'singleton'
 
 module CqmValidators
   CDA_SDTC_SCHEMA = 'lib/schema/infrastructure/cda/CDA_SDTC.xsd'
   QRDA_CAT1_R5_SCHEMATRON = 'lib/schematron/qrda/cat_1_r5/HL7 QRDA Category I STU 5.sch'
   QRDA_CAT1_R51_SCHEMATRON = 'lib/schematron/qrda/cat_1_r5_1/HL7 QRDA Category I STU 5.1.sch'