task-07: correct url

Author: PeterKietzmann

task-07/README.md

@@ -20,8 +20,8 @@ ping6 <RIOT-IPv6-addr>%tapbr0
 Note: on MAC use `bridge0` instead of `tapbr0`.
 
 ## Task 7.2: Extend `gnrc_minimal` application
-* Add the `gnrc_udp` module to the application's [Makefile]
-  (https://github.com/RIOT-OS/RIOT/blob/master/examples/gnrc_minimal/Makefile)
+* Add the `gnrc_udp` module to the application's
+[Makefile](https://github.com/RIOT-OS/RIOT/blob/master/examples/gnrc_minimal/Makefile)
 * To be able to receive packets, a [message queue](http://doc.riot-os.org/group__net__gnrc.html) must be 
   created using [msg_init_queue](https://doc.riot-os.org/group__core__msg.html#ga480e6f32c8ab18579b62a890f3fda2cd):