Minor NEWS.md tweaks

NEWS.md

@@ -1,8 +1,20 @@
 # epiprocess 0.7.1.9999
 
-* Patch `select` for grouped `epi_df`s PR #390
-* switched `other_keys` default from `NULL` to `character(0)` PR #390
-* minor doc updates PR #393
+Note that `epiprocess` uses the [Semantic Versioning
+("semver")](https://semver.org/) scheme for all release versions, but any
+inter-release development versions will include an additional ".9999" suffix.
+Pre-1.0.0 numbering scheme: when making changes to a development version
+0.x.y.9999, we will increment y when merging PRs, and will have increment x (and
+reset y) on release.
+
+## Breaking changes
+
+* Switched `epi_df`'s `other_keys` default from `NULL` to `character(0)`; PR #390
+
+## Improvements
+
+* `select` on grouped `epi_df`s now only drops `epi_df`ness if it makes sense; PR #390
+* Minor documentation updates; PR #393
 
 # epiprocess 0.7.0.9999
 
@@ -12,10 +24,6 @@
 
 # epiprocess 0.7.0
 
-Note that `epiprocess` uses the [Semantic Versioning
-("semver")](https://semver.org/) scheme for all release versions, but any
-inter-release development versions will include an additional ".9999" suffix.
-
 ## Breaking changes
 
 * Changes to `epi_slide` and `epix_slide`: