Rename README-generator -> readme_generator because python tools hate caps…

readme_generator/templates/README.md.j2

@@ -7,13 +7,13 @@
   * Using the [script helpers documentation.](https://yunohost.org/packaging_apps_helpers)
 * Add a `LICENSE` file for the package.
 * Edit `doc/DISCLAIMER*.md`
-* The `README.md` files are to be automatically generated by https://github.com/YunoHost/apps/tree/master/tools/README-generator
+* The `README.md` files are to be automatically generated by https://github.com/YunoHost/apps/tree/master/tools/readme_generator
 
 ---
 {% endif -%}
 
 <!--
-N.B.: This README was automatically generated by https://github.com/YunoHost/apps/tree/master/tools/README-generator
+N.B.: This README was automatically generated by https://github.com/YunoHost/apps/tree/master/tools/readme_generator
 It shall NOT be edited by hand.
 -->
 
@@ -88,4 +88,3 @@ sudo yunohost app upgrade {{manifest.id}} -u https://github.com/YunoHost-Apps/{{
 ```
 
 **More info regarding app packaging:** <https://yunohost.org/packaging_apps>
-

readme_generator/templates/README_fr.md.j2

@@ -1,5 +1,5 @@
 <!--
-N.B.: This README was automatically generated by https://github.com/YunoHost/apps/tree/master/tools/README-generator
+N.B.: This README was automatically generated by https://github.com/YunoHost/apps/tree/master/tools/readme_generator
 It shall NOT be edited by hand.
 -->