readme: add cache for watch examples

Author: zoubin

README.md

@@ -136,7 +136,11 @@ const reduce = require('reduce-css')
 
 const build = __dirname + '/build'
 const basedir = __dirname + '/src'
-const b = reduce.create({ basedir })
+const b = reduce.create({
+  basedir,
+  cache: {},
+  packageCache: {},
+})
 
 reduce.src('*.css', { cwd: basedir })
   .pipe(reduce.watch(b, 'bundle.css', { entryGlob: '*.css' }))
@@ -262,6 +266,8 @@ const path = require('path')
 const b = reduce.create({
   entries: ['a.css', 'b.css'],
   basedir: '/path/to/src',
+  cache: {},
+  packageCache: {},
 })
 b.plugin(reduce.bundler, 'bundle.css')
 b.plugin(reduce.watcher, { entryGlob: '*.css' })

example/gulp/multi/gulpfile.js

@@ -37,6 +37,8 @@ gulp.task('watch', ['clean'], function () {
     resolve: {
       paths: [path.join(__dirname, 'src', 'web_modules')],
     },
+    cache: {},
+    packageCache: {},
   })
   let count = 1
   return gulp.src('page/**/index.css', { cwd: basedir })

example/gulp/reduce/gulpfile.js

@@ -34,6 +34,8 @@ gulp.task('watch', ['clean'], function () {
     resolve: {
       paths: [path.join(__dirname, 'src', 'web_modules')],
     },
+    cache: {},
+    packageCache: {},
   })
   let count = 1
   return gulp.src('page/**/index.css', { cwd: basedir })

example/without-gulp/watch.js

@@ -5,7 +5,11 @@ const reduce = require('reduce-css')
 
 const build = __dirname + '/build'
 const basedir = __dirname + '/src'
-const b = reduce.create({ basedir })
+const b = reduce.create({
+  basedir,
+  cache: {},
+  packageCache: {},
+})
 
 del(build).then(function () {
   reduce.src('*.css', { cwd: basedir })