Fix warnings in build

[scambon]

Building shows the following warnings:

• [WARNING] /home/travis/build/scambon/CliWrapper4J/src/main/java/io/github/scambon/cliwrapper4j/converters/ResultConverter.java:32: warning - Tag @link: reference not found: int
• [WARNING] Property 'sonar.jacoco.reportPaths' is deprecated (JaCoCo binary format). 'sonar.coverage.jacoco.xmlReportPaths' should be used instead (JaCoCo XML format).
• [WARNING] Bytecode of dependencies was not provided for analysis of source files, you might end up with less precise results. Bytecode can be provided using sonar.java.libraries property.
• [WARNING] Could not find ref: develop in refs/heads or refs/remotes/origin

[scambon]

For passing libraries to SonarQube: this is a bug in SQ when having no dependencies. See https://jira.sonarsource.com/browse/MSONAR-170

[scambon]

Merged into develop