FPII-2034: DO NOT MERGE Update libpng to 1.6.20
DO NOT MERGE Update libpng to 1.6.20
BUG:23265085
Change-Id: I2fc2106965c789a54f04412e9c63a0901b0c1e71
(cherry picked from commit 0b39f202aaedd3029e4270d2af7d58ba6634f9cd)
diff --git a/contrib/README.txt b/contrib/README.txt
index bcd433d..97963c6 100644
--- a/contrib/README.txt
+++ b/contrib/README.txt
@@ -1,4 +1,5 @@
This "contrib" directory contains contributions which are not necessarily under
the libpng license, although all are open source. They are not part of
-libpng proper and are not used for building the library.
+libpng proper and are not used for building the library, although some are used
+for testing the library via "make check".