spec: Add pubdate to cmpn book
<releaseinfo xml:id="cmpn.book-release">Release 8</releaseinfo>
- <pubdate>TBD</pubdate>
+ <pubdate>October 2021</pubdate>
<copyright>
- <year>2000, 2020</year>
+ <year>2000, 2021</year>
<holder>Eclipse Foundation</holder>
</copyright>
