feat: add dcusum to namespace

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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    status: passed
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    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ndarray/lib/index.js

@@ -36,6 +36,15 @@ var setReadOnly = require( '@stdlib/utils/define-read-only-property' );
 */
 var ns = {};
 
+/**
+* @name dcusum
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/blas/ext/base/ndarray/dcusum}
+*/
+setReadOnly( ns, 'dcusum', require( '@stdlib/blas/ext/base/ndarray/dcusum' ) );
+
 /**
 * @name dsum
 * @memberof ns