Fixed the case of "Winelib".

diff --git a/DEVELOPERS-HINTS b/DEVELOPERS-HINTS
index 937c306..c379557 100644
--- a/DEVELOPERS-HINTS
+++ b/DEVELOPERS-HINTS
@@ -437,7 +437,7 @@
 ==================================================
 
 Functions and data which are internal to your code (or at least shouldn't be
-visible to any WineLib or Windows program) should be preceded by
+visible to any Winelib or Windows program) should be preceded by
 an identifier to the module:
 
 Examples: