typos, puml plugin

[h1alexbel]

PR-Codex overview

This PR focuses on making changes to the AssignOnIssueTest.java file and the pom.xml file.

Detailed summary

• Renamed the error message in AssignOnIssueTest.java from "Issue assignee %s does not match with expected %s" to "Posted comment %s does not match with expected %s".
• Added the plantuml-generator-maven-plugin version 1.1.2 to the pom.xml file.
• Added a new plugin configuration in the pom.xml file to generate diagrams and add them to the README file.
• Updated the comment in the pom.xml file regarding the scope of the hamcrest dependency.

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[h1alexbel]

@rultor merge

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a2caa92) 67.18% compared to head (14aa5e6) 67.18%. Report is 10 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #92 +/- ## ========================================= Coverage 67.18% 67.18% Complexity 81 81 ========================================= Files 29 29 Lines 323 323 Branches 19 19 ========================================= Hits 217 217 Misses 99 99 Partials 7 7 ```

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[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 5min)