Add `postrelease` make recipe to show dev version number in app

Makefile

@@ -103,6 +103,10 @@ release:
 	make build
 	npm run pack
 
+.PHONY: postrelease
+postrelease:
+	$(SED) -i '/^_converse.VERSION_NAME =/s/=.*/= "v$(VERSION)dev";/' src/headless/converse-core.js
+
 ########################################################################
 ## Install dependencies
 

RELEASE.md

@@ -17,3 +17,4 @@
     * Do the same for the root dir
 11. Run `npm publish && cd src/headless/ && npm publish`
 12. Update the repository on weblate
+13. Decide on next release number and run `make postrelease VERSION=5.0.1`

src/headless/converse-core.js

@@ -104,7 +104,7 @@ const _converse = {
     'promises': {}
 }
 
-_converse.VERSION_NAME = 'v4.2.0';
+_converse.VERSION_NAME = "v5.0.0dev";
 
 Object.assign(_converse, Backbone.Events);