Adds failOnWarning flag to support failing validation on Warning …

[gad0lin]

Adds failOnWarning flag to support failing validation on Warning severity

<plugin>
                <groupId>de.redsix</groupId>
                <artifactId>dmn-check-maven-plugin</artifactId>
                <version>1.2.0-SNAPSHOT</version>
                <configuration>
                    <failOnWarning>true</failOnWarning>
                </configuration>
                <executions>
                    <execution>
                        <phase>verify</phase>
                        <goals>
                            <goal>check-dmn</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

[codecov]

Codecov Report

Merging #18 (f1bb6ee) into master (618b596) will decrease coverage by 0.22%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##             master      #18      +/-   ##
============================================
- Coverage     84.34%   84.11%   -0.23%     
- Complexity      428      429       +1     
============================================
  Files            45       45              
  Lines           894      900       +6     
  Branches         45       46       +1     
============================================
+ Hits            754      757       +3     
- Misses          104      106       +2     
- Partials         36       37       +1     

Impacted Files	Coverage Δ
.../src/main/java/de/redsix/dmncheck/CheckerMain.java	55.55% <0.00%> (-1.59%)	⬇️
...ain/java/de/redsix/dmncheck/plugin/PluginBase.java	66.66% <66.66%> (-0.84%)	⬇️

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[pSub]

Looks good, thank you!