chore(npmrc): tweak npm config

Ryan A. Johnson · Ryan A. Johnson · commit e5e288272c7b · 2018-11-19T11:39:05.000-06:00
* use `*-rc.N` format for pre-releases
* configure the commit message format for `npm version`
diff --git a/.npmrc b/.npmrc
@@ -1 +1,4 @@
 registry=https://registry.npmjs.org/
+
+message = "chore(release): v%s [skip ci]"
+preid = "rc"
