FS #6759: Support tan function in calculator plugin. Patch by Luke Blaney.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13070 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index da13cc6..95ee473 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -287,3 +287,4 @@
 Pascal Briehl
 Denis Stanishevskiy
 Eddy Coman
+Luke Blaney