Update README.md

Author: marvin-mangold

README.md

@@ -18,8 +18,8 @@ This Library also works under Mono/MonoTouch
 Features
 ==============================
 - Support for Connecting to Siemens S7-300/400 and S5 PLCs
-- Support for for TIA Portal Projects via the Openness API
-- Support for reading als S7 DataTypes and Converting them to DotNet ones
+- Support for TIA Portal Projects via the Openness API
+- Support for reading S7 DataTypes and Converting them to DotNet ones
 - Support for combining multiple different Tags to one Read-Request 
 - Support for reading Step5 Projects (*.S5D)
 - Support for reading Step7 V5.5 Projects (*.S7P)
@@ -48,3 +48,4 @@ Special thanks
 Trademarks
 ==============================
 Step 5, Step 7, S7-300, S7-400 are Trademarks of Siemens
+