upgrading to python 3.9

README.md

@@ -83,9 +83,9 @@ For example on `sdc@dop814.astron.nl` (this is our sdc-dev test machine)
 > cd ~
 > mkdir ldv-migrate
 > cd ldvspec-migrate
-> virtualenv env3.8 -p python3.8 (on ubuntu)
-> python3 -m venv env3.8 (on centos)
-> source env3.8/bin/activate
+> virtualenv env3.9 -p python3.9 (on ubuntu)
+> python3 -m venv env3.9 (on centos)
+> source env3.9/bin/activate
 ```
 
 ### Installation

ldv_migrate/requirements.txt

 sshtunnel==0.4.0
-requests==2.27.1
+requests==2.28.1
 psycopg2-binary==2.9.3
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