require python 3 for all tools used in updates

docs/admin/Import-and-Update.md

@@ -220,14 +220,14 @@ For a list of other methods see the output of `./utils/update.php --help`.
 
 #### Installing the newest version of Pyosmium
 
-It is recommended to install Pyosmium via pip. Run (as the same user who
-will later run the updates):
+It is recommended to install Pyosmium via pip. Make sure to use python3.
+Run (as the same user who will later run the updates):
 
 ```sh
-pip install --user osmium
+pip3 install --user osmium
 ```
 
-Nominatim needs a tool called `pyosmium-get-updates`, which comes with
+Nominatim needs a tool called `pyosmium-get-updates` which comes with
 Pyosmium. You need to tell Nominatim where to find it. Add the
 following line to your `settings/local.php`:
 

docs/admin/Installation.md

@@ -50,7 +50,7 @@ For running Nominatim:
 
 For running continuous updates:
 
-  * [pyosmium](https://osmcode.org/pyosmium/)
+  * [pyosmium](https://osmcode.org/pyosmium/) (with Python 3)
 
 ### Hardware
 

utils/check_server_for_updates.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import sys
 from osmium.replication import server

utils/osm_file_date.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import osmium
 import sys