Update README.md and CHANGES.md for 1.5.1

Author: odaira

CHANGES.md

@@ -1,5 +1,23 @@
 # Change log
 
+## 1.5.1
+
+- [#135](https://github.com/lz4/lz4-java/issues/135)
+  Updated the JNI binding for Win32/amd64 from old LZ4 r123
+  to LZ4 1.8.3. (Rei Odaira)
+
+- [#134](https://github.com/lz4/lz4-java/issues/134)
+  Added Automatic-Module-Name to the manifest to support
+  the Java 9 modularity. (Rei Odaira)
+
+- [#131](https://github.com/lz4/lz4-java/issues/131)
+  Made the StreamingXXHash*JNI methods synchronized to avoid
+  a rare-case race condition with GC. (Roman Leventov, Rei Odaira)
+
+- [#128](https://github.com/lz4/lz4-java/pull/128)
+  Changed the Maven Central download link from a direct link
+  to a search link. (Adam Retter)
+
 ## 1.5.0
 
  - Upgraded LZ4 to 1.8.3. Updated JNI bindings for Linux/amd64,

README.md

@@ -119,8 +119,8 @@ You can download released artifacts from [Maven Central](https://search.maven.or
 
 # Documentation
 
- - [lz4](https://lz4.github.io/lz4-java/1.5.0/docs/net/jpountz/lz4/package-summary.html)
- - [xxhash](https://lz4.github.io/lz4-java/1.5.0/docs/net/jpountz/xxhash/package-summary.html)
+ - [lz4](https://lz4.github.io/lz4-java/1.5.1/docs/net/jpountz/lz4/package-summary.html)
+ - [xxhash](https://lz4.github.io/lz4-java/1.5.1/docs/net/jpountz/xxhash/package-summary.html)
  - [changelog](https://github.com/lz4/lz4-java/blob/master/CHANGES.md)
 
 # Performance
@@ -130,8 +130,8 @@ hashing performance can depend a lot on the input (there are lies, damn lies
 and benchmarks), here are some benchmarks that try to give a sense of the
 speed at which they compress/decompress/hash bytes.
 
- - [lz4 compression](https://lz4.github.io/lz4-java/1.5.0/lz4-compression-benchmark/)
- - [lz4 decompression](https://lz4.github.io/lz4-java/1.5.0/lz4-decompression-benchmark/)
+ - [lz4 compression](https://lz4.github.io/lz4-java/1.5.1/lz4-compression-benchmark/)
+ - [lz4 decompression](https://lz4.github.io/lz4-java/1.5.1/lz4-decompression-benchmark/)
  - [xxhash hashing](https://lz4.github.io/lz4-java/1.3.0/xxhash-benchmark/)
 
 # Build