Bump .version in mustache.js in git hook when version has changed

This changes the pre-commit hook that we've used for years to keep the
version value found in `package.json` in sync with the one in
`mustache.js`, to change `mustache.mjs` instead since that's where the
source code lives now.

Rakefile

@@ -12,11 +12,6 @@ task :test do
   sh "./node_modules/.bin/mocha test"
 end
 
-desc "Make a compressed build in #{minified_file}"
-task :minify do
-  sh "./node_modules/.bin/uglifyjs mustache.js > #{minified_file}"
-end
-
 desc "Run JSHint"
 task :hint do
   sh "./node_modules/.bin/jshint mustache.js"

hooks/pre-commit

@@ -34,9 +34,9 @@ class Bumper
 		# if bumped, do extra stuff and notify the user
 		if @bumped
 
-			# minify `mustache.js` using the Rakefile task
-			puts "> minifying `mustache.js`..."
-			`rake minify`
+			# keep .mjs & .js|.min.js in sync
+			puts "> building and minifying `mustache.mjs`..."
+			`npm run build`
 
 			# stage files for commit
 			`git add package.json`
@@ -78,7 +78,7 @@ class Bumper
 end
 
 bumper = Bumper.new([
-	Source.new('mustache.js', /mustache.version = '([\d\.]*)'/),
+	Source.new('mustache.mjs', /version: '([\d\.]*)'/),
 	Source.new('mustache.js.nuspec', /<version>([\d\.]*)<\/version>/),
 ])
 bumper.start