Update documentation for createPatch

Author: oBusk

README.md

@@ -75,7 +75,10 @@ npm install diff --save
     * `newStr` : New string value
     * `oldHeader` : Additional information to include in the old file header
     * `newHeader` : Additional information to include in the new file header
-    * `options` : An object with options. Currently, only `context` is supported and describes how many lines of context should be included.
+    * `options` : An object with options. 
+      - `context` describes how many lines of context should be included.
+      - `stripTrailingCr`: `true` to remove all trailing CR (`\r`) characters before perfoming the diff. 
+        This helps to get a useful diff when comparing files from UNIX/Windows respectively.
 
 * `Diff.createPatch(fileName, oldStr, newStr, oldHeader, newHeader)` - creates a unified diff patch.