Erro ao executar o Coveralls: coveralls:coveralls-maven-plugin:4.3.0:report: javax/xml/bind/DatatypeConverter

Solução bem simples, basta adicionar a dependência do jaxb-api no plugin do coveralls:

      <plugin>
          <groupId>org.eluder.coveralls</groupId>
          <artifactId>coveralls-maven-plugin</artifactId>
          <version>${build-plugin.coveralls.version}</version>
          <dependencies>
            <dependency>
                <groupId>javax.xml.bind</groupId>
                <artifactId>jaxb-api</artifactId>
                <version>2.3.1</version>
            </dependency>
          </dependencies>
      </plugin>