Release v1.3.1 on 2021-09-06.

1. 04c2375 db v5: prep for D-GSM: add vlr_via_proxy and sgsn_via_proxy by Neels Hofmeyr · 4 years, 6 months ago
2. 07e1602 db v4: add column last_lu_seen_ps by Neels Hofmeyr · 4 years, 7 months ago
3. 981e126 db upgrade: remove some code dup by Neels Hofmeyr · 4 years, 7 months ago
4. 7143f3a fix upgrade test in presence of ~/.sqliterc by Neels Hofmeyr · 4 years, 7 months ago
5. a8045da hlr db schema 3: hlr_number -> msc_number by Neels Hofmeyr · 4 years, 7 months ago
6. 5b65461 add db_upgrade test by Neels Hofmeyr · 4 years, 7 months ago