Fix missing newline

Author: twcook86

examples/async/include.am

@@ -7,4 +7,4 @@ EXTRA_DIST += examples/async/README.md \
 	examples/async/async_tls.c \
 	examples/async/async_tls.h \
 	examples/async/Makefile \
-	examples/async/user_settings.h
+	examples/async/user_settings.h