Update README to donwload latest jp version on Linux

Author: jamesls

README.md

@@ -25,11 +25,11 @@ Check the [Release page](https://github.com/jmespath/jp/releases)
  to download the latest ``jp`` executable.  There are binaries
 available for Windows, Linux, Mac, FreeBSD.
 
-For example, to install version 0.1.2 on a 64 bit Linux environment use:
+For example, to install the latest version on a 64 bit Linux environment use:
 
 ```
-sudo wget https://github.com/jmespath/jp/releases/download/0.1.2/jp-linux-amd64 -O /usr/local/bin/jp \
-&& sudo chmod +x /usr/local/bin/jp
+sudo wget https://github.com/jmespath/jp/releases/latest/download/jp-linux-amd64 \
+  -O /usr/local/bin/jp  && sudo chmod +x /usr/local/bin/jp            
 ```
 
 ## Building from Source