Update README with latest news

Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    minitest (5.6.0)
+    minitest (5.6.1)
     stringex (2.5.2)
 
 PLATFORMS
@@ -10,3 +10,6 @@ PLATFORMS
 DEPENDENCIES
   minitest (~> 5.6.0)
   stringex (~> 2.5.2)
+
+BUNDLED WITH
+   1.14.3

Makefile

@@ -1,3 +1,7 @@
-# Run the tests
+.PHONY: install test
+
+install:
+	bundle install
+
 test:
 	ruby test_data.rb

README.md

@@ -21,9 +21,18 @@ Data come from the following sources:
 
 All these sources were released under ODbL or compatible licences.
 
+## Tests
+
+If you're going to modify the file, don't forget to run the automated tests to ensure consistency of the information provided. This script is used in the build triggered by merge requests.
+
+```bash
+make install
+make test
+```
+
 ## The Data
 
-The file `stations.csv` contains all our data representing train stations. The file is UTF-8 encoded text file and Comma Separated Value (CSV) formatted – although a semi-colon `;` is used to delimitate fields.
+The file `stations.csv` contains all our data representing train stations and cities. The file is UTF-8 encoded text file and Comma Separated Value (CSV) formatted – although a semi-colon `;` is used to delimitate fields. Boolean flags are represented with t/f (true/false) values.
 
 ### Columns
 
@@ -37,17 +46,19 @@ Column Name | Notes
 `longitude` | Coordinates as decimal value.
 `latitude` | Coordinates as decimal value.
 `parent_station_id` | A station can belong to a _meta station_ whose `id` is this value, i.e. _Paris Gare d’Austerlitz_ belongs to the metastation _Paris_.
-`is_city` | This value is unreliable.
 `country` | 2 letters, [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2)
-`is_main_station` | This value is unreliable.
 `time_zone` | [Continent/Country ISO codes](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).
-`is_suggestable` | Can the user input this station.
+`is_city` | This value is unreliable.
+`is_main_station` | This value is unreliable.
+`is_airport` | Specify if the station is related to an airport.
+`is_suggestable` | Specify if the user can input this station.
+`country_hint` | Specify if the country should be displayed to disambiguate the station's name.
 `sncf_self_service_machine` | Presence of a SNCF self-service machine at the station.
 `same_as` | Some systems allow stations to be split in two, with two `id` values. If provided, the station identified by the given value should be considered as the actual station.
 
 #### Operator Specific
 
-Operator specific columns contain identifiers and values specific to the operator. Columns are prefixed with a name unique to the operator.
+Operator specific columns contain identifiers and values specific to the operator. Columns are prefixed with a name unique to the operator. `rt*` columns are about ids used in realtime APIs.
 
 Column Name | Notes
 ----------- | -----
@@ -63,12 +74,24 @@ Column Name | Notes
 `hkx_is_enabled` |
 `busbud_id` |
 `busbud_is_enabled` |
+`flixbus_id` |
+`flixbus_is_enabled` |
 `ouigo_id` |
 `ouigo_is_enabled` |
 `trenitalia_id` |
 `trenitalia_is_enabled` |
+`trenitalia_rtvt_id` |
 `ntv_id` |
 `ntv_is_enabled` |
+`ntv_rtiv_id` |
+`hkx_id` |
+`hkx_is_enabled` |
+`renfe_id` |
+`renfe_is_enabled` |
+`atoc_id` |
+`atoc_is_enabled` |
+`benerail_id` |
+`benerail_is_enabled` |
 
 #### Internationalisation
 
@@ -82,9 +105,10 @@ Column Name | Notes
 `info:de` |
 `info:it` |
 
-## Tests
+## Productivity tools
 
-```bash
-bundle install
-ruby test_data.rb
-```
+#### For internationalisation
+
+To facilitate the internationalisation of city names, we use and maintain a script querying [Geonames API](http://www.geonames.org/) to look for city name translations.
+
+The project is hosted [on Github](https://github.com/mgalibert/geonames) and contains its own documentation.