[tracker/sam/README] Update README for 3.0

[Sam Thursfield <sthursfield src gnome org>]

commit 7f35178af46b903edf0c41bb27ac18cd20444608
Author: Sam Thursfield <sam afuera me uk>
Date:   Mon Apr 20 19:41:54 2020 +0200

    Update README for 3.0

 README.md | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/README.md b/README.md
index 64d3ddfc7..3e2e9e672 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,10 @@ and mobile.
 
 The Tracker project is divided into two main repositories:
 
-  * [Tracker core](https://gitlab.gnome.org/GNOME/tracker) contains the database
-    (*tracker-store*), the database ontologies, the commandline user
-    interface (`tracker`), and several support libraries.
+  * [Tracker core](https://gitlab.gnome.org/GNOME/tracker) contains the
+    triplestore database, provided as the `libtracker-sparql` library
+    and implemented using [SQLite](http://sqlite.org/). This repo also contains
+    the database ontologies and the commandline user interface (`tracker`).
 
   * [Tracker Miners](https://gitlab.gnome.org/GNOME/tracker-miners) contains
     the indexer daemon (*tracker-miner-fs*) and tools to extract metadata