release notes: 3.1 - more stuff

RELEASE-NOTES

@@ -23,7 +23,7 @@
    saved in the wallet, and can be broadcast again.
  * Checkpoints: The initial download of a headers file was replaced
    with hardcoded checkpoints. The wallet uses one checkpoint per
-   retargetting period. The headers for a retargetting period are
+   retargeting period. The headers for a retargeting period are
    downloaded only if transactions need to be verified in this period.
  * The 'privacy' and 'priority' coin selection policies have been
    merged into one. Previously, the 'privacy' policy has been unusable
@@ -43,13 +43,33 @@
    between the acquisition and liquidation prices of outgoing coins is
    displayed in the wallet history. By default, historical exchange
    rates are used to compute acquisition and liquidation prices. These
-   value can also be entered manually, in order to match the actual
+   values can also be entered manually, in order to match the actual
    price realized by the user. The order of liquidation of coins is
    the natural order defined by the blockchain; this results in
    capital gain values that are invariant to changes in the set of
    addresses that are in the wallet. Any other ordering strategy (such
    as FIFO, LIFO) would result in capital gain values that depend on
    the set of addresses in the wallet.
+ * A new version of the Electrum protocol is required by the client
+   (version 1.2). Servers using older versions of the protocol will
+   not be displayed in the GUI.
+ * The Trezor T hardware wallet is now supported.
+ * BIP84: native segwit p2wpkh scripts for bip39 seeds and hardware
+   wallets can now be created when specifying a BIP84 derivation
+   path. This is usable with Trezor and Ledger.
+ * Windows: the binaries now include ZBar, and QR code scanning should work.
+ * The Wallet Import Format (WIF) for private keys that was extended in 3.0
+   is changed. Keys in the previous format can be imported, compatibility
+   is maintained. Newly exported keys will be serialized as
+   "script_type:original_wif_format_key".
+ * BIP32 master keys for testnet once again have different version bytes than
+   on mainnet. For the mainnet prefixes {x,y,Y,z,Z}|{pub|prv}, the
+   corresponding testnet prefixes are   {t,u,U,v,V}|{pub|prv}.
+   More details and exact version bytes are specified at:
+   https://github.com/spesmilo/electrum-docs/blob/master/xpub_version_bytes.rst
+   Note that due to this change, testnet wallet files created with previous
+   versions of Electrum must be considered broken, and they need to be
+   recreated from seed words.
 
 
 # Release 3.0.6 :