feat: add nanrange, nanrangeBy, rangeBy to namespace

---
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---

Author: kgryte

lib/node_modules/@stdlib/stats/lib/index.js

@@ -450,6 +450,24 @@ setReadOnly( ns, 'nanminBy', require( '@stdlib/stats/nanmin-by' ) );
 */
 setReadOnly( ns, 'nanminabs', require( '@stdlib/stats/nanminabs' ) );
 
+/**
+* @name nanrange
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/nanrange}
+*/
+setReadOnly( ns, 'nanrange', require( '@stdlib/stats/nanrange' ) );
+
+/**
+* @name nanrangeBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/nanrange-by}
+*/
+setReadOnly( ns, 'nanrangeBy', require( '@stdlib/stats/nanrange-by' ) );
+
 /**
 * @name padjust
 * @memberof ns
@@ -477,6 +495,15 @@ setReadOnly( ns, 'pcorrtest', require( '@stdlib/stats/pcorrtest' ) );
 */
 setReadOnly( ns, 'range', require( '@stdlib/stats/range' ) );
 
+/**
+* @name rangeBy
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/range-by}
+*/
+setReadOnly( ns, 'rangeBy', require( '@stdlib/stats/range-by' ) );
+
 /**
 * @name rangeabs
 * @memberof ns