Bump plugin parent POM

[basil]

Bumps the plugin parent POM from 3.48 to 3.54.

See the changelog and the full diff in the compare view.

[basil]

TeeStepTest.smokes fails on Windows with the following stack trace:

java.lang.AssertionError: 

Expected: a string containing "got: first message second message WS>rem"
     but: was "Started
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] node
Running on remote in C:\Jenkins\workspace\eline-utility-steps-plugin_PR-72\target\tmp\j h8512543174852602852\workspace\p
[Pipeline] {
[Pipeline] dir
Running in C:\Jenkins\workspace\eline-utility-steps-plugin_PR-72\target\tmp\j h14870851017203151330\workspace\p
[Pipeline] {
[Pipeline] tee
[Pipeline] {
[Pipeline] echo
first message
[Pipeline] semaphore
Resuming build at Wed Dec 18 22:23:33 UTC 2019 after Jenkins restart
Waiting to resume part of p #1: Finished waiting
Waiting to resume part of p #1: ‘Jenkins’ doesn’t have label ‘remote’
‘remote’ is offline
Ready to run at Wed Dec 18 22:23:36 UTC 2019
[Pipeline] echo
second message
[Pipeline] isUnix
[Pipeline] bat
[Pipeline] }
[Pipeline] // tee
[Pipeline] readFile
[Pipeline] pwd
[Pipeline] echo
got: first message second message jenkins@win2019-1d7e20 WS>rem
[Pipeline] }
[Pipeline] // dir
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS
"
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
	at org.junit.Assert.assertThat(Assert.java:956)
	at org.junit.Assert.assertThat(Assert.java:923)
	at org.jvnet.hudson.test.JenkinsRule.assertLogContains(JenkinsRule.java:1402)
	at org.jenkinsci.plugins.pipeline.utility.steps.fs.TeeStepTest.lambda$smokes$1(TeeStepTest.java:75)
	at org.jvnet.hudson.test.RestartableJenkinsRule$3.evaluate(RestartableJenkinsRule.java:232)
	at org.jvnet.hudson.test.RestartableJenkinsRule$6.evaluate(RestartableJenkinsRule.java:272)
	at org.jvnet.hudson.test.JenkinsRule$1.evaluate(JenkinsRule.java:598)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.lang.Thread.run(Thread.java:834)

That failure doesn't seem related to this change, since it also occurred in #71. I suspect the same would occur on master as well, if a build were run again today.

As far as I can tell, this change will be ready to merge once master itself is clean.

[basil]

I recommend reviewing this change with the "Hide whitespace changes" option enabled.

[rsandell]

To do this change you must first move the docs from the wiki to the readme. But I also don't like putting user docs in the root readme, that file is more imho for visitors of the repo itself. So the docs should be put in for example docs/README.md

[basil]

To do this change you must first move the docs from the wiki to the readme.

I have no interest in doing this, so I will revert the change.