RFR: 7116: Update version to 8.1.0 in master [v4]

[Marcus Hirt]

On Mon, 25 Jan 2021 15:17:27 GMT, Jie Kang <jkang at openjdk.org> wrote:

>> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Using the flattening plug-in in the application as well
>
> core/pom.xml line 274:
> 
>> 272: 			<plugin>
>> 273: 				<groupId>org.codehaus.mojo</groupId>
>> 274: 				<artifactId>flatten-maven-plugin</artifactId>
> 
> @thegreystone 
> Can the flatten-maven-plugin also be used for jmc too? The artifacts produced for jmc-core look good now, but the ones produced for jmc have m2 pom files with ${revision}${changelist}.

Yes, certainly. Added. Let me know if it works the way you want.

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PR: https://git.openjdk.java.net/jmc/pull/206