upstream: add pepredicates

requires astropy 4.0.0

(cherry picked from commit 5d0fd888)
16 jobs for !94 with pesummary-0.4.0-production in 61 minutes and 2 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Render
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render:linux

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render:osx

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render:osx

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  Test
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test:linux:igwn-py27-proposed

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passed #719354
test:linux:igwn-py27-testing

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test:linux:igwn-py36-testing

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passed #719356
test:linux:igwn-py37-proposed

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test:linux:igwn-py37-testing

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passed #726277
macos
test:osx:igwn-py27-proposed

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test:osx:igwn-py27-testing

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macos
test:osx:igwn-py36-testing

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macos
test:osx:igwn-py37-proposed

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test:osx:igwn-py37-testing

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failed #726243
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test:osx:igwn-py27-proposed

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test:osx:igwn-py27-proposed

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  Docs
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docs

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