Update README and NEWS

Author: kientzle

NEWS

@@ -1,3 +1,11 @@
+Jul 19, 2018: Avoid super-linear slowdown on malformed mtree files
+
+Jan 27, 2018: Many fixes for building with Visual Studio
+
+Oct 19, 2017: NO_OVERWRITE doesn't change existing directory attributes
+
+Aug 12, 2017: New support for Zstandard read and write filters
+
 Jul 09, 2017: libarchive 3.3.2 released
 
 Mar 16, 2017: NFSv4 ACL support for Linux (librichacl)

README.md

@@ -99,6 +99,7 @@ The library also detects and handles any of the following before evaluating the
   * lzma, lzip, and xz compression
   * lz4 compression
   * lzop compression
+  * zstandard compression
 
 The library can create archives in any of the following formats:
   * POSIX ustar
@@ -125,6 +126,7 @@ When creating archives, the result can be filtered with any of the following:
   * lzma, lzip, and xz compression
   * lz4 compression
   * lzop compression
+  * zstandard compression
 
 ## Notes about the Library Design
 
@@ -159,7 +161,7 @@ questions we are asked about libarchive:
 
 * On read, compression and format are always detected automatically.
 
-* The same API is used for all formats; in particular, it's very
+* The same API is used for all formats; it should be very
   easy for software using libarchive to transparently handle
   any of libarchive's archiving formats.