Adding curl interlude

Author: icculp

04_0_Sending_Bitcoin_Transactions.md

@@ -25,5 +25,6 @@ Supporting objectives include the ability to:
      * [Interlude: Using JQ](04_2__Interlude_Using_JQ.md)
   * [Section Three: Creating a Raw Transaction with Named Arguments](04_3_Creating_a_Raw_Transaction_with_Named_Arguments.md)
   * [Section Four: Sending Coins with Raw Transactions](04_4_Sending_Coins_with_a_Raw_Transaction.md)
+     * [Interlude: Using Curl](04_4__Interlude_Using_Curl.md)
   * [Section Five: Sending Coins with Automated Raw Transactions](04_5_Sending_Coins_with_Automated_Raw_Transactions.md)
   * [Section Six: Creating a SegWit Transaction](04_6_Creating_a_Segwit_Transaction.md)