Scalastyle 1.0.0 with Scala 2.12#22

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tashoyan wants to merge 8 commits intoscalastyle:masterfrom

tashoyan:scalastyle-1.0.0

Commits on Jul 27, 2019

Extract artifact versions to Maven properties. Upgrade Maven API and tools. Upgrade JUnit. Upgrade Java to 1.8.
arseniy.tashoyan
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Set Scalastyle version to the latest release: 1.0.0 - hopefuly the plugin release will not depend on a snapshot
arseniy.tashoyan
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Upgrade to Scala 2.12 compatible Scalastyle
arseniy.tashoyan
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Use a property instead of hardcode
arseniy.tashoyan
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Remove unused property
arseniy.tashoyan
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Update the plugin version in the doc
arseniy.tashoyan
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Upgrade Scala to 2.12 and Java to 8
arseniy.tashoyan
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Workaround for build failures on Travis CI when using oraclejdk8: Expected feature release number in range of 9 to 14, but got: 8
arseniy.tashoyan
committed