feat: add options doc and multipart options-progress doc (#370)

* feat: add options doc and multipart options-progress doc

* feat: change stsToken link to en

* feat: change progress doc

* feat: rm wrong words

* feat: change stsToken params to [stsToken]

* feat: add thunk or generator example about progress

Author: binghaiwang

README.md

@@ -144,6 +144,7 @@ options:
 
 - accessKeyId {String} access key you create on aliyun console website
 - accessKeySecret {String} access secret you create
+- [stsToken] {String} used by temporary authorization, detail [see](https://www.alibabacloud.com/help/doc-detail/32077.htm)
 - [bucket] {String} the default bucket you want to access
   If you don't have any bucket, please use `putBucket()` create one first.
 - [endpoint] {String} oss region domain. It takes priority over `region`.
@@ -1534,7 +1535,7 @@ parameters:
 - [options] {Object} optional args
   - [parallel] {Number} the number of parts to be uploaded in parallel
   - [partSize] {Number} the suggested size for each part
-  - [progress] {Function} the progress callback called after each
+  - [progress] {Function} thunk or generator, the progress callback called after each
     successful upload of one part, it will be given three parameters:
     (percentage {Number}, checkpoint {Object}, res {Object})
   - [checkpoint] {Object} the checkpoint to resume upload, if this is
@@ -1581,14 +1582,45 @@ var result = yield store.multipartUpload('object', '/tmp/file', {
 
 var result = yield store.multipartUpload('object', '/tmp/file', {
   checkpoint: savedCpt,
-  progress: function* (p, cpt, res) {
+  progress: function* (p, cpt, res) { //progress is generator
     console.log(p);
     console.log(cpt);
     console.log(res.headers['x-oss-request-id']);
   }
 });
 
 ```
+
+- multipartUpload progress example
+
+```js
+//thunk
+function thunkProgress(p, cpt, res) {
+  return function(done) {
+    console.log(p);
+    console.log(cpt);
+    console.log(res.headers['x-oss-request-id']);
+    done();
+  }
+}
+
+var result1 = yield store.multipartUpload('object', '/tmp/file', {
+  progress: thunkProgress
+});
+
+//generator
+function* generatorProgress(p, cpt, res) {
+    console.log(p);
+    console.log(cpt);
+    console.log(res.headers['x-oss-request-id']);
+}
+
+var result2 = yield store.multipartUpload('object', '/tmp/file', {
+  progress: generatorProgress
+});
+
+```
+
 - multipartUpload with cancel
 
 >tips: cancel multipartUpload, now only support browser.