Update README.md

Fixed wrong github path.

Author: Martin Köditz

README.md

@@ -13,7 +13,7 @@ $ zypper in php7-devel libfbclient2 libfbclient-devel
 
 Now make sure you provide the fbclient.so and the header files (ibase.h). These are needed to compile. You can specify the include path for the ibase.h file with CPPFLAGS as you can see in the following listing.
 ```
-$ git clone https://github.com/MartinKoeditz/php-firebird.git
+$ git clone https://github.com/FirebirdSQL/php-firebird.git
 $ cd php-firebird
 $ phpize
 $ CPPFLAGS=-I/usr/include/firebird ./configure