add number dataType to logger

[ryandawsonuk]

fixes #1699

[seldondev]

Wed Apr 15 13:27:59 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-1700/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1700 --build=2

[seldondev]

Wed Apr 15 13:28:02 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-1700/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1700 --build=1

[ryandawsonuk]

/lgtm
/approve

[seldondev]

@ryandawsonuk: you cannot LGTM your own PR.

In response to this:

/lgtm
/approve

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[seldondev]

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