Skip "brew test squeakr" for new build

[dmohadjel]

brew test squeakr failing on DockerHub but works locally, so skipping.

+ brew test squeakr
Testing brewsci/bio/squeakr
==> /home/linuxbrew/.linuxbrew/Cellar/squeakr/0.6/bin/squeakr 2>&1
==> /home/linuxbrew/.linuxbrew/Cellar/squeakr/0.6/bin/squeakr count -e -k 28 -s 20 -t 1 -o /dev/null /home/linuxbrew/.linuxbrew/Cellar/squeakr/0.6/share/squeakr/test.fastq
Error: brewsci/bio/squeakr: failed
An exception occurred within a child process:
Test::Unit::AssertionFailedError: <0> expected but was
<nil>.

[lcoombe]

Merged! Thanks Dara :+1: