Update README.md

SunggyuLee · web-flow · commit 23f0342499a7 · 2018-12-16T06:38:43.000+09:00
fix word
diff --git a/README.md b/README.md
@@ -86,7 +86,7 @@ __Properties__
 
 ###### View the algorithm in [action][shell-toptal]
 
-### Time-Compexity Graphs
+### Time-Complexity Graphs
 
 Comparing the complexity of sorting algorithms (Bubble Sort, Insertion Sort, Selection Sort)
 
