Added Changelog / Updated README

Author: stephanfeb

CHANGELOG.md

@@ -0,0 +1,23 @@
+
+* Release 1.4.1
+*** New Features
+New Locking / Unlocking Script Builders 
+    - P2MSLock/UnlockBuilder - Pay to Multisig. This is naked MultiSig (the proper way to do multisig).
+    - P2PKLock/UnlockBuilder - Pay to Public Key
+    - P2SHLock/UnlockBuilder - Pay to Script Hash. This should be considered deprecated. Nodes support his for backwards compatibility only.
+    - P2PKHDataLockBuilder - This is something new. Create a spendable data output.
+    - UnspendableDataLockBuilder - OP_RETURN Data builder. Prepends a Transaction Output Script with OP_FALSE OP_RETURN followed by a series of data pushes.
+    - SpendableDataLockBuilder - OP_DROP-style locking script builder. Allows creation of P2PKH-spendable data outputs. 
+    - Added tests and fixes for Locking / Unlock builders
+
+*** API Changes
+    - Changed toASM / fromASM API to be in line with that generated / used by 'bsv' and 'dartsv' libraries.
+    - Made some classes and constants public to be accessible when using the read-only lib
+    - Modified the interface to use "getLockingScript()" and "getUnlockScript()" instead of scriptSig and scriptPubkey.
+
+*** Bug Fixes 
+    - Fixed a bug that prevented TransactionBuilder from creating any transactions that had no change output specified.
+    - Bug fix for Transaction ID (bytes weren't reversed) and a new test to make sure the Transaction ID corresponds to its hash
+    - Removed / Changed wrong or outdated code-comments.
+
+-----------

README.md

@@ -23,13 +23,18 @@ This library lacks, and will not implement :
 * Taproot 
 
 Current Supported features are :
-* Custom-Script Builder Interface to support novel locking/spending conditions within Script
 * Unbounded Transaction Types (creating non-standard transactions)
-* P2PKH Transaction Builder (Explicit helper to make TX assembly easier)
 * HD Key Derivation \(BIP32\)
 * Mnemonic Seed Support \(BIP39\)
 * Original Bitcoin Address format 
 * A built-in Bitcoin Script Interpreter
+* Custom-Script Builder Interface to support novel locking/spending conditions within Script
+    * P2PKH Transaction Builder - Pay to Pubkey Hash standard Transactions 
+    * P2MS Transaction Builder - Pay to Multisig. This is naked MultiSig (the proper way to do multisig).
+    * P2PK Transaction Builder - Pay to Public Key standard Transactions
+    * P2SH Transaction Builder - Pay to Script Hash. This should be considered deprecated. Nodes support his for backwards compatibility only.
+    * P2PKHDataLockBuilder - This is something new. Create a spendable data output. Spendable using P2PKH Transaction. 
+    * UnspendableDataLockBuilder - OP_RETURN-style Data builder. Prepends a Transaction Output Script with OP_FALSE OP_RETURN followed by a series of data pushes.
 
 ## Acknowledgement