Update pip for clinical-db in .travis.yml

[patrikgrenfeldt]

This PR fixes the pip version used when CI Genotype

How to test:

• [x] open travis PR-check
• [x] click on the clinical-db Prod dependency check

Expected test outcome:

• [x] check that it installs pip=20.0.2
• [x] Take a screenshot and attach or copy/paste the output.

Review:

• [x] code approved by @northwestwitch
• [x] tests executed by @patrikgrenfeldt
• [x] "Merge and deploy" approved by @patrikgrenfeldt Thanks for filling in who performed the code review and the test!

This version is a:

• [ ] MAJOR - when you make incompatible API changes
• [ ] MINOR - when you add functionality in a backwards compatible manner
• [x] PATCH - when you make backwards compatible bug fixes or documentation/instructions

[patrikgrenfeldt]

Thanx for the review @northwestwitch!

[patrikgrenfeldt]

Test result: 👍