Update README.md

Author: dejanrizvan

README.md

@@ -14,8 +14,6 @@ Python 2.7 and Python 3.x compatible
 Usage
 -----
 
-Just like the plain-old function node, but writting Python instead of Javascript.
-The msg is a dictionary, (almost) all the Node-RED helper functions are avaiable, and its behaviour
+Just like the plain-old function node, but writing Python instead of Javascript.
+The msg is a dictionary, (almost) all the Node-RED helper functions are available, and its behavior
  is expected to be exactly the same (at some point in the future at least).
- 
-