Fix README

_fc-publications/README

@@ -8,17 +8,17 @@ Add your plug-in to the file `_data/publications.yml`. Note there are 3
 categories:
 
   - distributed with Frama-C
-	- internal CEA plug-in
-	- external plug-in
+  - internal CEA plug-in
+  - external plug-in
 
 Put your plug-in in the right one.
 
 There are two mandatory fields and an optional one:
 
   - id: a unique identifier, with only lower-case characters
-	- name: the name of your plug-in
-	- short: a short name for your plug-in if its name is more than 10 characters
-	  long.
+  - name: the name of your plug-in
+  - short: a short name for your plug-in if its name is more than 10 characters
+    long.
 
 Create a directory named as the unique identifier of your plugin in the
 directory `_fc-publications`.
@@ -76,4 +76,4 @@ In other directories, it can be:
 - other
 
 Note that if you think you need a new category, it can be added, but the file
-`html/publications.html` should be updated accordingly.
+`html/publications.html` should be updated accordingly.
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