[gnome-software/mwleeds/minor-docs-fixes: 1/2] README: Fix build instructions

[Phaedrus Leeds <mwleeds src gnome org>]

commit a63621732d79cda7af81e7b156f834dffbec603a
Author: Phaedrus Leeds <mwleeds endlessos org>
Date:   Tue Feb 16 13:12:24 2021 -0800

    README: Fix build instructions
    
    Without this addition, the executable fails to find libappstream.so

 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index 2f76341cc..f8ca2f943 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Build locally with:
 $ meson --prefix $PWD/install build/
 $ ninja -C build/ all install
 $ killall gnome-software
-$ XDG_DATA_DIRS=install/share:$XDG_DATA_DIRS ./install/bin/gnome-software
+$ XDG_DATA_DIRS=install/share:$XDG_DATA_DIRS LD_LIBRARY_PATH=install/lib64/:$LD_LIBRARY_PATH 
./install/bin/gnome-software
 ```
 
 # Debugging
@@ -50,4 +50,4 @@ Running with `--verbose` will give detailed logging information.
 Software is maintained by several co-maintainers, as listed in `gnome-software.doap`.
 All changes to Software need to be reviewed by at least one co-maintainer (who
 can’t review their own changes). Larger decisions need input from at least two
-co-maintainers.
+