documentation about dry-run mode

README.md

@@ -1,20 +1,21 @@
 # Mark
 
-Mark it's tool for syncing your markdown documentation with Atlassian Confluence pages.
+Mark it's tool for syncing your markdown documentation with Atlassian
+Confluence pages.
 
 This is very usable if you store documentation to your orthodox software in git
 repository and don't want to do a handjob with updating Confluence page using
 fucking tinymce wysiwyg enterprise core editor.
 
 You can store a user credentials in the configuration file, which should be
-located in ~/.config/mark with following format:
+located in `~/.config/mark` with following format:
 ```
 username = "smith"
 password = "matrixishere"
 ```
 
 Mark can read Confluence page URL and markdown file path from another specified
-configuration file, which you can specify using -c <file> flag. It is very
+configuration file, which you can specify using `-c <file>` flag. It is very
 usable for git hooks. That file should have following format:
 ```toml
 url = "http://confluence.local/pages/viewpage.action?pageId=123456"
@@ -23,8 +24,8 @@ file = "docs/README.md"
 
 ## Usage:
 ```
-mark [-u <username>] [-p <password>] -l <url> -f <file>
-mark [-u <username>] [-p <password>] -c <file>
+mark [--dry-run] [-u <username>] [-p <password>] -l <url> -f <file>
+mark [--dry-run] [-u <username>] [-p <password>] -c <file>
 mark -v | --version
 mark -h | --help
 ```
@@ -33,6 +34,8 @@ mark -h | --help
 - `-p <password>` - Use specified password for updating Confluence page.
 - `-l <url>` - Edit specified Confluence page.
 - `-f <file>` - Use specified markdown file for converting to html.
-- `-c <file>` - Specify configuration file which should be used for reading Confluence page URL and markdown file path.
+- `-c <file>` - Specify configuration file which should be used for reading
+        Confluence page URL and markdown file path.
+- `--dry-run` - Show resulting HTML and don't update Confluence page content.
 - `-v | --version`  - Show version.
 - `-h | --help` - Show help screen and call 911.