[epiphany] Revert version bump

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 7e038bdb3412d1c7aa25fca5e92ade2806d05bbb
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Sep 11 18:30:07 2020 -0500

    Revert version bump
    
    ../meson.build:61:5: ERROR: String 'alpha' cannot be converted to int

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index dd00056fc..2b570a6a2 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('epiphany', 'c',
   license: 'GPL3+',
-  version: '40.alpha',
+  version: '3.38.0',
   meson_version: '>= 0.46.0',
   default_options: ['c_std=gnu11',
                     'warning_level=2']