Fix regex for setting the version number.

updates #1366

Makefile

@@ -85,7 +85,7 @@ po2json:
 .PHONY: release
 release:
 
-	$(SED) -ri 's/_converse.VERSION_NAME = "v[0-9]\+\.[0-9]\+\.[0-9]\+";/ _converse.VERSION_NAME = "$(VERSION)";/' src/headless/converse-core.js
+	$(SED) -ri 's/_converse.VERSION_NAME = "v[0-9]+\.[0-9]+\.[0-9]+";/ _converse.VERSION_NAME = "v$(VERSION)";/' src/headless/converse-core.js
 	$(SED) -ri s/Version:\ [0-9]\+\.[0-9]\+\.[0-9]\+/Version:\ $(VERSION)/ COPYRIGHT
 	$(SED) -ri s/Project-Id-Version:\ Converse\.js\ [0-9]\+\.[0-9]\+\.[0-9]\+/Project-Id-Version:\ Converse.js\ $(VERSION)/ locale/converse.pot
 	$(SED) -ri s/\"version\":\ \"[0-9]\+\.[0-9]\+\.[0-9]\+\"/\"version\":\ \"$(VERSION)\"/ package.json

dist/converse.js

@@ -62552,7 +62552,7 @@ const _converse = {
   'templates': {},
   'promises': {}
 };
-_converse.VERSION_NAME = "v4.0.5";
+_converse.VERSION_NAME = "v4.0.6";
 
 _lodash_noconflict__WEBPACK_IMPORTED_MODULE_4___default.a.extend(_converse, Backbone.Events); // Make converse pluggable
 

src/headless/converse-core.js

@@ -72,7 +72,7 @@ const _converse = {
     'promises': {}
 }
 
-_converse.VERSION_NAME = "v4.0.5";
+ _converse.VERSION_NAME = "v4.0.6";
 
 _.extend(_converse, Backbone.Events);