Bump build-flow-plugin from 0.12 to 0.20

[dependabot-preview]

Bumps build-flow-plugin from 0.12 to 0.20.

Changelog

Sourced from build-flow-plugin's changelog.

CHANGELOG

All notable changes to this project will be documented in this file.

[Unreleased][unreleased]

• cancel the correct queued build (pull request #61)
• threads in parallel blocks now have names (pull request #54)
• remove comma in the "caused by" section (pull request #62)
• fix abort in parallel ignore blocks (pull request #64)
• links to builds now have a context menu (pull request #60)

[0.18] - (released Jun. 10, 2015)

• display the tree of upstream causes (pull request #56)
• now depends on jenkins core 1.509.1 (LTS)

[0.17] - (released Nov. 26, 2014)

• swap dependency with buildgraph-view (revert from 0.13, see #50).
• FlowCause now derives from UpstreamCause (pull request #53)

[0.16] - (released Oct. 08, 2014)

• add syntax highlighting in DSL textarea (pull request #52)

[0.15] - (released Sep. 10, 2014)

• fix missing displayName (pull request #51)

[0.14] - (released Sep. 09, 2014)

• enable test-jar for plugins leveraging the extension point.
• use build.displayName in JobInvocation.toString (pull request #29)

[0.13] - (released Sep. 09, 2014)

• read DSL from a file (pull request #47)
• fix buildgraph when using 2nd level flows (pull request #50)
• swap dependency with buildgraph-view (pull request #50)

Commits

• de52c96 [maven-release-plugin] prepare release build-flow-plugin-0.20
• aebdc35 Add support for building with gradle
• 85de99a Make "target" directory if it does not exist
• d3c3ca6 Build flow sections created in older Jenkins versions disappeared in Jenkins 2.x
• 89a9037 Eliminate deprecated warnings
• 3bbc963 Fix JDK 1.8 compilation problem
• 44e528b Replace deprecated Bug with Issue
• 8e57b70 [maven-release-plugin] prepare for next development iteration
• a0d50ba [maven-release-plugin] prepare release build-flow-plugin-0.19
• 045d453 Fix javadoc for JDK 1.8
• Additional commits viewable in compare view

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