update changes document

include changes proposed by @buggywhip
fix typos

[skip ci]

changes

@@ -1,17 +1,20 @@
 XXX, 2014
-v1.18 -- Added Camellia block cipher
+v1.18.0
+      -- Added Camellia block cipher
       -- Thanks to Karel Miko for cotributing a bunchload of patches and additions, namely
          OCBv3, DSA and ECC key generation FIPS-186-4 compliance, BASE64-URL encoding,
          a bugfix in Camellia,
-      -- Larry Bugbee contributed the necessary stuff to easier include libtomcrypt
-         in a foreign language like python, as shown in his pyTomCrypt
+      -- Larry Bugbee contributed the necessary stuff to more easily call libtomcrypt
+         from a dynamic language like Python, as shown in his pyTomCrypt
       -- Nikos Mavrogiannopoulos contributed RSA blinding and export of RSA and DSA keys
          in OpenSSL/GnuTLS compatible format
       -- Patrick Pelletier contributed a smart volley of patches
       -- RyanC contributed HKDF including documentation (yippie)
       -- Added 2-key Triple-DES mode, thanks to Paul Howarth
-      -- Christopher Braun contributed some patches and additions to ASN.1/DER
-      -- Applied some patches from the OLPC project regarding PKCS#1 and preventing the
+      -- Christopher Brown contributed some patches and additions to ASN.1/DER
+      -- Pascal Brand of STMicroelectronics contributed patches regarding the
+         XTS mode and RSA private key operations with keys without CRT parameters
+      -- Applied some patches from the OLPC project regarding PKCS#1 and preventing
          the hash algorithms from overflowing
       -- Fixed the Bleichbacher Signature attack in PKCS#1 v1.5 EMSA, thanks to Alex Dent
       -- Add PKCS#1 testvectors from RSA
@@ -21,6 +24,7 @@ v1.18 -- Added Camellia block cipher
       -- Documentation (crypt.pdf) is now built deterministically, thanks to Michael Stapelberg
       -- Removed all compiler warnings
       -- Improved/extended several tests
+      -- Add SHA512/256 and SHA512/224
       -- Bugfix multi2
       -- Bugfix Noekeon
       -- Bugfix XTEA