Update README.md: add @latest to cli install command

Author: corneliusroemer

README.md

@@ -21,7 +21,7 @@ go get github.com/pierrec/lz4/v4
 There is a command line interface tool to compress and decompress LZ4 files.
 
 ```
-go install github.com/pierrec/lz4/v4/cmd/lz4c
+go install github.com/pierrec/lz4/v4/cmd/lz4c@latest
 ```
 
 Usage