feat(cache): new 'clearCache' method.

Author: benjamin-allion

index.js

@@ -1,7 +1,7 @@
 const {
-  normalize, normalizePaths, NodeTypes, oasFlatten
+  normalize, normalizePaths, NodeTypes, oasFlatten, clearCache
 } = require('./lib');
 
 module.exports = {
-  normalize, normalizePaths, NodeTypes, oasFlatten
+  normalize, normalizePaths, NodeTypes, oasFlatten, clearCache
 };

lib/index.js

@@ -1,9 +1,10 @@
-const { normalize, normalizePaths } = require('./core/normalizer');
+const { normalize, normalizePaths, clearCache } = require('./core/normalizer');
 const { NodeTypes } = require('./core/types');
 const { oasFlatten } = require('./core/oasFlatter');
 
 module.exports = {
   normalize,
+  clearCache,
   normalizePaths,
   NodeTypes,
   oasFlatten