testing a collapsible section of README

Author: Steve Thompson

README.md

@@ -64,6 +64,9 @@ getPublicArray(array = []): PublicArray
 
 #### filter: PublicArrayFilter (read-only)
 ###### Has methods that narrow down the content of the array and return the PublicArrayFilter instance:
+<details>
+  <summary>Click to see methods</summary>
+
 ```
 filter.byTest(testFunction: ((currentValue, currentIndex?, array?) => boolean)): PublicArrayFilter
     // Narrows down the array to only the values that pass testFunction.
@@ -73,6 +76,8 @@ filter.byType(
 ): PublicArrayFilter
     // Narrows down the array to only values that are the specified type.
 ```
+</details>
+
 
 #### getConverted: PublicArrayGetterConverter (read-only)
 ###### Has the Array methods .map()  and  .reduce() , but renamed to  .each()  and  .toOne() , respectively.  None of them modify the array.