[MCHANGES-411] Issue link is mangled if project.issueManagement.url does not end with slash (/)

**[Unassigned Developer](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=unassigned-developer)** opened **[MCHANGES-411](https://issues.apache.org/jira/browse/MCHANGES-411?redirect=false)** and commented

Consider the follwing block in your POM:

```xml

GitHub
https://github.com/michael-o/tomcatspnegoad/issues

```

The changes report will turn the issue link into `https://github.com/michael-o/tomcatspnegoad/%ISSUE%` because here (https://github.com/apache/maven-changes-plugin/blob/e85711fd246c505e5e088c16014afd2d5fe91e0c/src/main/java/org/apache/maven/plugins/changes/ChangesReportGenerator.java#L634-L646) it will chop off the last components, ignoring it will end with a slash or not.

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No further details from [MCHANGES-411](https://issues.apache.org/jira/browse/MCHANGES-411?redirect=false)

Start in src/main/java/org/apache/maven/plugins/changes/ChangesReportGenerator.java at the URL handling around lines 634-646. Reproduce the report with an issueManagement URL that lacks a trailing slash, then adjust the handling so the generated issue link retains the configured base URL and verify the resulting link.

Written by the indexing model from the issue text.