Got restrict-maven-plugin working with java 8

While running restrict-maven-plugin against a java8 project got the following error:
```
[ERROR] Failed to execute goal com.yamanyar:restrict-maven-plugin:0.6:restrict (default) on project invoice-issuer-business: Can not inspect all the artifacts: invalid constant type: 18 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.yamanyar:restrict-maven-plugin:0.6:restrict (default) on project invoice-issuer-business: Can not inspect all the artifacts
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Can not inspect all the artifacts
        at com.yamanyar.mvn.plugin.RestrictMojo.execute(RestrictMojo.java:87)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        ... 19 more
Caused by: java.io.IOException: invalid constant type: 18
        at javassist.bytecode.ConstPool.readOne(ConstPool.java:967)
        at javassist.bytecode.ConstPool.read(ConstPool.java:910)
        at javassist.bytecode.ConstPool.<init>(ConstPool.java:127)
        at javassist.bytecode.ClassFile.read(ClassFile.java:625)
        at javassist.bytecode.ClassFile.<init>(ClassFile.java:52)
        at javassist.CtClassType.<init>(CtClassType.java:95)
        at javassist.ClassPool.makeClass(ClassPool.java:588)
        at com.yamanyar.mvn.plugin.inspectors.Inspector.inspectClass(Inspector.java:105)
        at com.yamanyar.mvn.plugin.inspectors.Inspector.inspectClassFile(Inspector.java:218)
        at com.yamanyar.mvn.plugin.inspectors.Inspector.inspectFolder(Inspector.java:227)
        at com.yamanyar.mvn.plugin.RestrictMojo.execute(RestrictMojo.java:84)
        ... 21 more
```