Update usage output

Author: lahmatiy

README.md

@@ -25,24 +25,26 @@ npm install -g csso-cli
 ## Usage
 
 ```
-csso [input] [options]
+Usage:
+
+    csso [input] [options]
 
 Options:
 
-      --comments <value>           Comments to keep: exclamation (default), first-exclamation or none
-      --debug [level]              Output intermediate state of CSS during a compression
-  -d, --declaration-list           Treat input as a declaration list
-      --force-media-merge          Enable unsafe merge of @media rules
-  -h, --help                       Output usage information
-  -i, --input <filename>           Input file
-      --input-source-map <source>  Input source map: none, auto (default) or <filename>
-      --no-restructure             Disable structural optimisations
-  -o, --output <filename>          Output file (result outputs to stdout if not set)
-  -s, --source-map <destination>   Generate source map: none (default), inline, file or <filename>
-      --stat                       Output statistics in stderr
-  -u, --usage <filename>           Usage data file
-  -v, --version                    Output version
-      --watch                      Watch source file for changes
+        --comments <value>             Comments to keep: exclamation (default), first-exclamation or none
+        --debug [level]                Output intermediate state of CSS during a compression
+    -d, --declaration-list             Treat input as a declaration list
+        --force-media-merge            Enable unsafe merge of @media rules
+    -h, --help                         Output usage information
+    -i, --input <filename>             Input file
+        --input-source-map <source>    Input source map: none, auto (default) or <filename>
+    -o, --output <filename>            Output file (result outputs to stdout if not set)
+        --no-restructure               Disable structural optimisations
+    -s, --source-map <destination>     Generate source map: none (default), inline, file or <filename>
+        --stat                         Output statistics in stderr
+    -u, --usage <filename>             Usage data file
+    -v, --version                      Output version
+        --watch                        Watch source file for changes
 ```
 
 Some examples: