feat: add acosdf to namespace

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    status: passed
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---

Author: kgryte

lib/node_modules/@stdlib/math/base/special/lib/index.js

@@ -90,6 +90,15 @@ setReadOnly( special, 'acos', require( '@stdlib/math/base/special/acos' ) );
 */
 setReadOnly( special, 'acosd', require( '@stdlib/math/base/special/acosd' ) );
 
+/**
+* @name acosdf
+* @memberof special
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/math/base/special/acosdf}
+*/
+setReadOnly( special, 'acosdf', require( '@stdlib/math/base/special/acosdf' ) );
+
 /**
 * @name acosf
 * @memberof special