fix tabs

README.md

@@ -2,23 +2,23 @@
 
 - Install required packages
 
-	$ sudo apt-get install build-essential
+        $ sudo apt-get install build-essential
 
 - Fork this repository
 
 - (Preferably) Build examples and APUE library
 
-	$ make
+        $ make
 
 - Populate your own examples in `local*` subdirectories.  For example:
 
-	$ cd local
+        $ cd local
         $ $EDITOR local.c
 
   **Please note that the main source filename must be same as the subdirectory name (i.e. `local1/local1.c`)**
 
 - Build and run your example
 
-	$ cd .. # chdir to top dir
-	$ make
+        $ cd .. # chdir to top dir
+        $ make
         $ local/local