Updated markdown syntaxes

Author: khangvum

README.md

@@ -1,21 +1,21 @@
 # polyanalyzer
 
-A Windows console application that analyzes ***linear***, ***quadratic***, ***cubic***, and ***quartic*** functions. It generates the ***variation table*** of the function and can provide detailed ***mathematical insights***.
+A Windows console application that analyzes **_linear_**, **_quadratic_**, **_cubic_**, and **_quartic_** functions. It generates the **_variation table_** of the function and can provide detailed **_mathematical insights_**.
 
 ## Features
 
--   Analyze functions of degree 1 to 4 (***linear*** to ***quartic***).
--   Display the ***variation table*** of the function.
+-   Analyze functions of degree 1 to 4 (**_linear_** to **_quartic_**).
+-   Display the **_variation table_** of the function.
 -   With the verbose (`-v`) switch, calculate and display:
 
-    1.  ***x-intercepts***
-    2.  ***y-intercept***
-    3.  ***Domain***
-    4.  ***Range***
-    5.  ***Extrema*** (Minima & Maxima)
-    6.  ***Symmetry*** (Even, Odd, or neither)
-
--   Simple, fast, and lightweight ***console-based*** interface.
+    1.  **_x-intercepts_**
+    2.  **_y-intercept_**
+    3.  **_Domain_**
+    4.  **_Range_**
+    5.  **_Extrema_** (Minima & Maxima)
+    6.  **_Symmetry_** (Even, Odd, or neither)
+
+-   Simple, fast, and lightweight **_console-based_** interface.
 
 ## Usage