Helping with some English grammar in the README

I've made very small edits to the English text in the README to make it easier for English speakers to understand how to use Ran.

readme.md

@@ -13,7 +13,7 @@ Ran is a simple web server for serving static files.
 - Access logging
 - Custom 404 error file
 
-## What Ran for?
+## What is Ran for?
 
 - File sharing in LAN or home network
 - Web application testing
@@ -42,13 +42,13 @@ You can also call `./build.py` command under the Ran source directory to write v
 
 ## Download binary
 
-You can also download Ran binary without build it yourself.
+You can also download the Ran binary without building it yourself.
 
 [Download Ran binary from the release page](https://github.com/m3ng9i/ran/releases).
 
 ## Run Ran
 
-You can start a web server without any options by typing `ran` and press return in terminal window. This will use the following default configuration:
+You can start a web server without any options by typing `ran` and pressing return in terminal window. This will use the following default configuration:
 
 Configuration               | Default value
 ----------------------------|--------------------------------
@@ -93,7 +93,7 @@ Example 2: Set root to /tmp, list files of directories and set a custom 404 page
 ran -p=/tmp -l=true -404=/404.html
 ```
 
-Example 3: Close gzip compression, set access username and password:
+Example 3: Turn off gzip compression, set access username and password:
 
 ```bash
 ran -g=false -a=user:pass