Fix weight mapping

Ouch!
diff --git a/src/fcweight.c b/src/fcweight.c
index 036a518..67103c4 100644
--- a/src/fcweight.c
+++ b/src/fcweight.c
@@ -29,8 +29,8 @@
     {   0, FC_WEIGHT_THIN },
     { 100, FC_WEIGHT_THIN },
     { 200, FC_WEIGHT_EXTRALIGHT },
-    { 350, FC_WEIGHT_DEMILIGHT },
     { 300, FC_WEIGHT_LIGHT },
+    { 350, FC_WEIGHT_DEMILIGHT },
     { 380, FC_WEIGHT_BOOK },
     { 400, FC_WEIGHT_REGULAR },
     { 500, FC_WEIGHT_MEDIUM },