RFR: 8195072: Update ASM 3rd party legal (TPL) copyright to 6.0

[Kumar Srinivasan]

Hello,

Could I get a review for this simple update to the 3rd party legal (TPL) 
information.

Thanks

Webrev: http://cr.openjdk.java.net/~ksrini/8195072/webrev.00/
JBS: https://bugs.openjdk.java.net/browse/JDK-8195072
Current ASM copyright: 
http://hg.openjdk.java.net/jdk/jdk10/file/c674ff28c69d/src/java.base/share/classes/jdk/internal/org/objectweb/asm/AnnotationVisitor.java
Current ASM version: 
http://hg.openjdk.java.net/jdk/jdk10/file/c674ff28c69d/src/java.base/share/classes/jdk/internal/org/objectweb/asm/version.txt