[libgweather] data: Update README.sources

[Bastien Nocera <hadess src gnome org>]

commit 168a58f0bd95edf7b0ac217b7b57e94f2b1db559
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Dec 6 18:26:21 2017 +0100

    data: Update README.sources
    
    s/subversion/git/
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791313

 data/sources/README.sources |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/sources/README.sources b/data/sources/README.sources
index 57cf4c6..88310bb 100644
--- a/data/sources/README.sources
+++ b/data/sources/README.sources
@@ -8,10 +8,10 @@ Locations.xml.in is generated from 6 primary sources:
     data/sources/US_CONCISE.txt
     data/sources/geonames_dd_dms_date_*.txt
 
-The first two are maintained by us and are checked in to subversion.
+The first two are maintained by us and are checked in to git.
 The other four are produced by the US government and can be downloaded
 off the web. Since they are very large, and only needed when
-regenerating Locations.xml.in, they are not checked in to subversion
+regenerating Locations.xml.in, they are not checked in to git
 and must be downloaded to data/sources by hand if you want to rebuild
 Locations.xml.in.