.travis.yml: raise sleep delay
.travis.yml: raise sleep delay

Previous sleep delay value seems to be not enough nowadays.

.travis.yml (SLEEP_A_BIT): Raise sleep delay.

cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace