Replace tabs with spaces

Fixes travis build

Author: zoffixznet

README.md

@@ -11,15 +11,15 @@ files correctly, because this is Perl 6 Pod, and github assumes Perl 5 POD).
 
 This module is available via the Perl 6 module ecosystem. Use
 
-	zef install p6doc
-	
+    zef install p6doc
+    
 to install the binaries and make it available in your binaries
 execution path.
 
 Once it has been dowloaded, run
 
-	p6doc-index build
-	
+    p6doc-index build
+    
 to build the index.
 
 ## Use
@@ -36,8 +36,8 @@ to see the documentation for method `split` in class `Str`. You can
 skip the `./bin` part if you have installed it via `panda` or
 `zef`. You can also do
 
-	p6doc -f slurp
-	
+    p6doc -f slurp
+    
 to browse the documentation of standard functions. Depending on your
 disk speed and Rakudo version, it might take a while.