Correcting install package version number

Aligning version number in install instruction to initial note.

Author: xJom

book/01-introduction/sections/installing.asc

@@ -75,8 +75,8 @@ It's generally a little clearer what the latest version is on the GitHub page, b
 
 Then, compile and install:
 
-  $ tar -zxf git-1.9.1.tar.gz
-  $ cd git-1.9.1
+  $ tar -zxf git-2.0.0.tar.gz
+  $ cd git-2.0.0
   $ make configure
   $ ./configure --prefix=/usr
   $ make all doc info