fix mathtype

README.md

@@ -1,9 +1,9 @@
 # naive_GA
 <h1>How to use</h1>
 <ul>
-    <li>Run $python main.py$ to run the code</li>
-    <li>Run $python submain.py$ to run the code with multiprocessing</li>
+    <li>Run <i>python main.py</i> to run the code</li>
+    <li>Run <i>python submain.py</i> to run the code with multiprocessing</li>
     <li>Changing fitness function in main.py</li>
     <li>All the result will be stored in result folder</li>
-    <li>Run $python graph_creator.py$ to create the graph with 4 options. Can change file path in option.py according to format (line1: value, line2: problem_size, line3: standard_deviation</li>
+    <li>Run <i>python graph_creator.py</i> to create the graph with 4 options. Can change file path in option.py according to format (line1: value, line2: problem_size, line3: standard_deviation</li>
 </ul>