Mark toHaveBeenCalledBefore and After's second parameter as optional (#…

…650)

* Mark toHaveBeenCalledBefore's second parameter as optional

`toHaveBeenCalledBefore`'s first parameter should be optional because it has a default value.

* Mark toHaveBeenCalledAfter's second parameter as optional

types/index.d.ts

@@ -146,7 +146,7 @@ interface CustomMatchers<R> extends Record<string, any> {
    * @param {Mock} mock
    * @param {boolean} [failIfNoSecondInvocation=true]
    */
-  toHaveBeenCalledBefore(mock: jest.MockInstance<any, any[]>, failIfNoSecondInvocation: boolean): R;
+  toHaveBeenCalledBefore(mock: jest.MockInstance<any, any[]>, failIfNoSecondInvocation?: boolean): R;
 
   /**
    * Use `.toHaveBeenCalledAfter` when checking if a `Mock` was called after another `Mock`.
@@ -156,7 +156,7 @@ interface CustomMatchers<R> extends Record<string, any> {
    * @param {Mock} mock
    * @param {boolean} [failIfNoFirstInvocation=true]
    */
-  toHaveBeenCalledAfter(mock: jest.MockInstance<any, any[]>, failIfNoFirstInvocation: boolean): R;
+  toHaveBeenCalledAfter(mock: jest.MockInstance<any, any[]>, failIfNoFirstInvocation?: boolean): R;
 
   /**
    * Use `.toHaveBeenCalledOnce` to check if a `Mock` was called exactly one time.