maint: post-release administrivia

* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.

3 files changed, 5 insertions, 2 deletions

diff --git a/.prev-version b/.prev-version
index 9f55b2cc..8c50098d 100644
--- a/.prev-version
+++ b/.prev-version
@@ -1 +1 @@
-3.0
+3.1
diff --git a/NEWS b/NEWS
index 2aaa8552..81f51b59 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,8 @@
 GNU grep NEWS                                    -*- outline -*-
 
+* Noteworthy changes in release ?.? (????-??-??) [?]
+
+
 * Noteworthy changes in release 3.1 (2017-07-02) [stable]
 
 ** Improvements
diff --git a/cfg.mk b/cfg.mk
index 3403766e..92159154 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -63,7 +63,7 @@ export VERBOSE = yes
 # 1127556 9e
 export XZ_OPT = -6e
 
-old_NEWS_hash = a708c1088278e4d60e8e4ad2759228de
+old_NEWS_hash = 51c3b77c72f53965e784cb4a8074842c
 
 # Many m4 macros names once began with 'jm_'.
 # Make sure that none are inadvertently reintroduced.