Update release notes

Author: whaeck

ReleaseNotes.md

@@ -1,7 +1,7 @@
 # Release Notes—NJOY2016
 Given here are some release notes for NJOY2016. Each release is made through a formal [Pull Request](https://github.com/njoy/NJOY2016/pulls) made on GitHub. There are links in this document that point to each of those Pull Requests, where you can see in great details the changes that were made. Often the Pull Requests are made in response to an [issue](https://github.com/njoy/NJOY2016/issues). In such cases, links to those issues are also given.
 
-## [NJOY2016.70](https://github.com/njoy/NJOY2016/pull/xxx)
+## [NJOY2016.70](https://github.com/njoy/NJOY2016/pull/295)
 This update fixes a number of minor issues:
   - Fixed an issue in HEATR when reading evaluations with large multiplicity tables in MF6.
   - Fixed an issue in HEATR when calculating the average outgoing energy from a distribution that uses multiple interpolation ranges in TAB1 records (test 79 was added to detect this issue in the future). Mainly nuclides using MF5 instead of MF6 are impacted by this change (e.g. Sn119 and Sn122 from ENDF/B-VIII.0).