Fixed listings.

README.rst

@@ -14,6 +14,7 @@ Compilation
 -----------
 
 ::
+
     git clone git://github.com/mireq/minetest-mapper-cpp.git minetest-mapper-cpp
     cd minetest-mapper-cpp/
     cmake .
@@ -26,6 +27,7 @@ Binary `minetest_mapper` has two mandatory paremeters, `-i` (input world path)
 and `-o` (output image path).
 
 ::
+
     ./minetest_mapper -i /home/user/.minetest/worlds/my_world/ -o /home/user/map.png