Update README.md

Author: YujiSODE

README.md

@@ -17,19 +17,19 @@ This function returns an object with some methods to control.
 - `src`: an optional filename or pathname of an image for background
 
 ### Main methods
-#### 1) resizing and background
+#### 1) Resizing and background
 - `resize(w,h,src)`; it sets canvas size and background image
 - `setDivisions(x,y)`; it sets horizontal and vertical divisions
   - `w` and `h`: new values for canvas width and canvas height
   - `src`: filename or pathname of an image; 'none' is default value
   - `x` and `y`: numbers for horizontal and vertical divisions
 
-#### 2) colors
+#### 2) Colors
 - `setColor(rgb,alpha)`; it sets rgb color and alpha value
   - `rgb`: rgb color value
   - `alpha`: an optional value between 0.0 (fully transparent) and 1.0 (fully opaque)
 
-#### 3) focus area
+#### 3) Focus area
 - `xy(x,y)`; it puts focus on a area that is specified using integer coordinates
   - `x` and `y`: positive integer indices for horizontal and vertical divisions