fix tensorflow==2.1 in outliers example

[RafalSkolasinski]

Outliers example depends on both alibi and alib-detect.
These two have contradicting dependency on tensorflow, former one currently requiring TF<2 and latter requiring TF>=2.0 .

Because in outliers detector example we use alibi to only fetch a dataset this tiny PR fixes tensorflow to be compatible with alibi-detect.

[seldondev]

Wed Jan 22 15:10:47 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1358/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1358 --build=1

[seldondev]

Wed Jan 22 15:10:53 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1358/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1358 --build=2

[axsaucedo]

Nice one
/approve
/lgtm

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[seldondev]

failed to trigger Pull Request pipeline

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• failed to list files in directory /var/tmp/gitrepo660600678/.lighthouse
• open /var/tmp/gitrepo660600678/.lighthouse
• no such file or directory