Fix broken link int README.adoc
Fix broken link int README.adoc

Signed-off-by: Kate Stanley <59c12a62b1d23be702ac06d493bad7887a15d0c5@uk.ibm.com>

microprofile/microprofile-conference,karianna/microprofile-conference,katheris/microprofile-conference,karianna/microprofile-conference,AndyGee/microprofile-conference,AndyGee/microprofile-conference,microprofile/microprofile-conference,katheris/microprofile-conference,AndyGee/microprofile-conference,microprofile/microprofile-conference,AndyGee/microprofile-conference,katheris/microprofile-conference,katheris/microprofile-conference,AndyGee/microprofile-conference,katheris/microprofile-conference,karianna/microprofile-conference,microprofile/microprofile-conference,karianna/microprofile-conference,karianna/microprofile-conference,microprofile/microprofile-conference