make TLS 1.1 ref more clear ahead of "Improvable"
make TLS 1.1 ref more clear ahead of "Improvable"

Closes #18

jmhodges/howsmyssl,jmhodges/howsmyssl,leocassarani/howsmyssl,nxn128/SSLTest,jmhodges/howsmyssl,nxn128/SSLTest