spelling error readme

README.md

@@ -12,7 +12,7 @@ This small program should answer all these questions.
 +1. Create a basic GUI -- Partly done
 +2. Create the basic web search -- Partly done
 +3. Calculate the center of the milky way at a specific time -- Implemented but still not correct
-+4. Write a simple plot-library based on Cairo -- Partly done but ot implemented
++4. Write a simple plot-library based on Cairo -- Partly done but not implemented
 -5. Calculate sunrise and sunset at a spesific day -- Still trying to find appropriet formulas 
 -6. Find the position of the moon at a spesific time -- Still trying to find appropriet formulas
 -7. Present these information in a nice plot -- Library necessary