fix: select default branch

[ingkebil]

Description

This PR fixes

[0|0|650] θ63° [kenny.billiau@hasta:~/git/servers] [base] microsalt 14s ± bash resources/hasta.scilifelab.se/update-microsalt-stage.sh master
on the host hasta.scilifelab.se, continue
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2688  100  2688    0     0   8479      0 --:--:-- --:--:-- --:--:--  8452
/dev/fd/63: line 7: ${$1+x}: bad substitution

Primary function of PR

• [ ] Hotfix
• [x] Patch
• [ ] Minor functionality improvement
• [ ] New type of analysis
• [ ] Backward-breaking functionality improvement
• [ ] This change requires internal documents to be updated
• [ ] This change requires another repository to be updated

Testing

• [ ] Install microsalt with /home/proj/stage/servers/resources/hasta.scilifelab.se/update-microsalt-stage.sh master

Expected outcome: microSALT installs without errors.

Test results

These are the results of the tests, and necessary conclusions, that prove the stability of the PR.

Sign-offs

• [x] Code reviewed by @sylvinite
• [ ] Code tested by @sylvinite ? ;)
• [ ] Approved to run at Clinical-Genomics by @ingkebil

[sylvinite]

Nifty! Shouldn't be failing. I just did a stupid with the TRAVIS_BRANCH variable.

[sylvinite]

Due to the urgency of getting travis builds running again, and the size of the fix, and the nuisance of updating the .travis file; this got directly pulled into master.