Merge pull request #233 from pedramsaleh/patch-2

commented out header lines

README.md

     fileCache : true,
   })
   .fetch('GET', 'http://www.example.com/file/example.zip', {
-    some headers ..
+    //some headers ..
   })
   .then((res) => {
     // the temp file path
     appendExt : 'png'
   })
   .fetch('GET', 'http://www.example.com/file/example.zip', {
-    some headers ..
+    //some headers ..
   })
   .then((res) => {
     // the temp file path with file extension `png`
 
 ```js
   RNFetchBlob.fetch('POST', 'http://www.example.com/upload', {
-      ... some headers,
+      //... some headers,
       'Content-Type' : 'octet-stream'
     }, base64DataString)
     // listen to upload progress event
 
 ```js
   RNFetchBlob.fetch('POST', 'http://www.example.com/upload', {
-      ... some headers,
+      //... some headers,
       'Content-Type' : 'octet-stream'
     }, base64DataString)
     // listen to upload progress event, emit every 250ms