fix a bug of README.md

README.md

@@ -3,21 +3,21 @@ Cunix kernel
 
 # Version
 `0.362s-boot`:  
-    `Boot` read `loader` from `boot-device`, then it jumps to it.  
-    Loader doesn't load anything, it just enable long-mode and paging.  
-    Loader defines temporary page table at `0x70000` (0x0000:0x7000),  
-    it uses `2MB` page to make 0-12 MB memory to `0x0000 - 0xc0000`.  
+<pre>`Boot` read `loader` from `boot-device`, then it jumps to it.  
+<pre>Loader doesn't load anything, it just enable long-mode and paging.  
+<pre>Loader defines temporary page table at `0x70000` (0x0000:0x7000),  
+<pre>it uses `2MB` page to make 0-12 MB memory to `0x0000 - 0xc0000`.  
 
 `0.385s-boot`:  
-    rebuild `boot` and `loader`.  
+<pre>rebuild `boot` and `loader`.  
 
 `0.391s-boot`:  
-    loader` forgot open A20 line, so `0.385` and `0.362` just can  
-    use 1MB memory like real-mode.  
+<pre>loader` forgot open A20 line, so `0.385` and `0.362` just can  
+<pre>use 1MB memory like real-mode.  
 
 `0.432s-boot`:  
-    make directory `include/`, and add segment.inc, but it doesn't work. :-)  
+<pre>make directory `include/`, and add segment.inc, but it doesn't work. :-)  
 
 `0.451s-boot`:  
-    `boot` can load 8 sectors (4KB) of loader (not 1 sector).  
+<pre>`boot` can load 8 sectors (4KB) of loader (not 1 sector).