nyc: exclude export files added only for deprecation (#2425)

Author: IvanGoncharov

.nycrc.yml

@@ -5,6 +5,14 @@ exclude:
   - 'src/polyfills'
   - '**/*-benchmark.js'
   - '**/*.d.ts'
+  - 'src/validation/rules/ExecutableDefinitions.js'
+  - 'src/validation/rules/LoneSchemaDefinition.js'
+  - 'src/validation/rules/PossibleTypeExtensions.js'
+  - 'src/validation/rules/UniqueDirectiveNames.js'
+  - 'src/validation/rules/UniqueEnumValueNames.js'
+  - 'src/validation/rules/UniqueFieldDefinitionNames.js'
+  - 'src/validation/rules/UniqueTypeNames.js'
+  - 'src/validation/rules/UniqueOperationTypes.js'
 clean: true
 temp-directory: 'coverage/tests'
 report-dir: 'coverage/tests'