update instructions

README.md

@@ -209,7 +209,7 @@ If building from the git sources the `configure` script must be first generated.
 The source code is now ready to be configured.  This is done by running the `configure` script, and passing it the locations of *libuv* and *jansson*, and also the location where *wampcc* should finally be installed.
 
 ```bash
-./configure  --prefix=/var/tmp/wampcc_install  --with-libuv=/opt/libuv-1.10.2 --with-jansson=/opt/jansson-2.7
+./configure  --prefix=/var/tmp/wampcc_install  --with-libuv=/opt/libuv-1.10.2 --with-jansson=/opt/jansson-2.10
 ```
 
 Note that the locations of *libuv* and *jansson* will be specific to your host, and will unlikely match this example.