Use npm to bump version

gulpfile.js

@@ -1,9 +1,6 @@
 const path = require('path');
 const gulp = require('gulp');
 const concat = require('gulp-concat');
-const spawn = require('child_process').spawn;
-const util = require('gulp-util');
-const version = require('./package').version;
 
 const prismScripts = [
   'prismjs/components/prism-core',
@@ -17,54 +14,6 @@ const prismScripts = [
 prismScripts.push(
   path.join(path.dirname(require.resolve('prismjs/components/prism-core')), 'prism-!(*.min).js'));
 
-function exec(commands, cb) {
-  if (commands.length === 0) {
-    cb();
-    return;
-  }
-  let file;
-  let args;
-  const command = commands.shift();
-  const options = {
-    cwd: process.cwd(),
-  };
-  // Credit: https://github.com/nodejs/node/blob/master/lib/child_process.js
-  if (process.platform === 'win32') {
-    file = process.env.comspec || 'cmd.exe';
-    args = ['/s', '/c', `"${command}"`];
-    options.windowsVerbatimArguments = true;
-  } else {
-    file = '/bin/sh';
-    args = ['-c', command];
-  }
-  const proc = spawn(file, args, options);
-  proc.stdout.pipe(process.stdout);
-  proc.stderr.pipe(process.stderr);
-  proc.on('error', (error) => {
-    util.log(util.colors.red(error));
-    cb(error);
-  });
-  proc.on('exit', (code) => {
-    if (code) {
-      cb(code);
-    } else {
-      exec(commands, cb);
-    }
-  });
-}
-
 gulp.task('build-prism', () => gulp.src(prismScripts)
   .pipe(concat('prism.js'))
   .pipe(gulp.dest(path.dirname(require.resolve('prismjs')))));
-
-gulp.task('tag', (cb) => {
-  const tag = `v${version}`;
-  util.log(`Tagging as: ${util.colors.cyan(tag)}`);
-  exec([
-    'git add package.json',
-    'git commit -m "Prepare release"; true', // Ignore "no changes added to commit" error
-    `git tag -a ${tag} -m "Version ${version}"`,
-    'git push origin master --tags',
-    'npm publish',
-  ], cb);
-});

package.json

@@ -13,10 +13,11 @@
     "start": "node build/dev-server.js",
     "build": "node build/build.js",
     "lint": "eslint --ext .js,.vue src",
-    "patch": "yarn run lint && npm-bump patch",
-    "minor": "yarn run lint && npm-bump minor",
-    "major": "yarn run lint && npm-bump major",
-    "tag": "gulp tag"
+    "preversion": "npm run lint",
+    "postversion": "git push origin master --tags && npm publish",
+    "patch": "npm version patch -m \"Tag v%s\"",
+    "minor": "npm version minor -m \"Tag v%s\"",
+    "major": "npm version major -m \"Tag v%s\""
   },
   "dependencies": {
     "bezier-easing": "^1.1.0",