Fix font name and text format in README

DejaVuSansMono for Powerline --> DejaVu Sans Mono for Powerline

DejaVuSansMono/README.rst

@@ -1,6 +1,6 @@
-DejaVuSansMono for Powerline
-============================
+DejaVu Sans Mono for Powerline
+==============================
 
 :Font creator: Roy Y.T. Chen
 :Source: http://dejavu-fonts.org/wiki/Main_Page
-:Patched by: `dbrgn <https://github.com/dbrgn`
+:Patched by: `dbrgn <https://github.com/dbrgn>`_