Update README

Author: georgyb

README.md

@@ -13,10 +13,10 @@ Image Block for the [CodeX Editor](https://ifmo.su/editor).
 - Pasting images by drag-n-drop
 - Pasting files and screenshots from Clipboard
 - Allows to add border, background
-- Allows to stretch image to the container's full-width 
+- Allows to stretch image to the container's full-width
 
 **Note** This Tool requires server-side implementation for file uploading. See [backend response format](#server-format) for more details.
-  
+
 ## Installation
 
 ### Install via NPM
@@ -53,25 +53,25 @@ Add a new Tool to the `tools` property of the CodeX Editor initial config.
 ```javascript
 var editor = CodexEditor({
   ...
-  
+
   tools: {
     ...
     image: {
       class: ImageTool,
       config: {
         endpoints: {
-          byFile: 'http://localhost:8008/uploadFile', // Your backend file uploader endpoint 
-          byUrl: 'http://localhost:8008/fetchUrl', // Your endpoint that provides uploading by Url 
+          byFile: 'http://localhost:8008/uploadFile', // Your backend file uploader endpoint
+          byUrl: 'http://localhost:8008/fetchUrl', // Your endpoint that provides uploading by Url
         }
       }
     }
   }
-  
+
   ...
 });
 ```
 
-## Config Params 
+## Config Params
 
 Image Tool supports these configuration parameters:
 
@@ -125,19 +125,19 @@ This Tool returns `data` with following format
 
 ## Backend response format <a name="server-format"></a>
 
-This Tool works by one of following schemes:
+This Tool works by one of the following schemes:
 
 1. Uploading files from the device
 2. Uploading by URL (handle image-like URL's pasting)
-3. Uploading by drag-n-drop file 
-4. Uploading by pasting from Clipboard 
+3. Uploading by drag-n-drop file
+4. Uploading by pasting from Clipboard
 
 ### Uploading files from device <a name="from-device"></a>
 
 Scenario:
 
 1. User select file from the device
-2. Tool sends it to **your** backend (on `config.endpoint.byFile` route) 
+2. Tool sends it to **your** backend (on `config.endpoint.byFile` route)
 3. Your backend should save file and return file data with JSON at specified format.
 4. Image tool shows saved image and stores server answer
 
@@ -158,24 +158,24 @@ Response of your uploader **should** cover following format:
 
 **success** - uploading status. 1 for successful, 0 for failed
 
-**file** - uploaded file data. **Must** contain an `url` field with full public path to the uploaded image. 
-Also, can contain any additional fields you want to store. For example, width, height, id etc. 
-All additional fields will be saved at the `file` object of output data.    
+**file** - uploaded file data. **Must** contain an `url` field with full public path to the uploaded image.
+Also, can contain any additional fields you want to store. For example, width, height, id etc.
+All additional fields will be saved at the `file` object of output data.
 
 ### Uploading by pasted URL
 
 Scenario:
 
-1. User pastes and URL for image file to the Editor
+1. User pastes an URL of the image file to the Editor
 2. Editor pass pasted string to the Image Tool
-3. Tool sends it to **your** backend (on `config.endpoint.byUrl` route) via 'url' POST-parameter 
+3. Tool sends it to **your** backend (on `config.endpoint.byUrl` route) via 'url' POST-parameter
 3. Your backend should accept URL, **download and save the original file by passed URL** and return file data with JSON at specified format.
 4. Image tool shows saved image and stores server answer
 
 Response of your uploader should be at the same format as described at «[Uploading files from device](#from-device)» section
- 
- 
+
+
 ### Uploading by drag-n-drop or from Clipboard
 
-Your backend will accept file as FormData object in field name, specified by `config.field` (by default, «`image`»). 
-You should save it and return the same response format as described above.  
+Your backend will accept file as FormData object in field name, specified by `config.field` (by default, «`image`»).
+You should save it and return the same response format as described above.