Use the shorter sha256sum instead of sha512sum
diff --git a/sync.txt b/sync.txt
index 961ba1a..a09f434 100644
--- a/sync.txt
+++ b/sync.txt
@@ -1,6 +1,6 @@
-script/sync.sh ran on 2021-03-12
-Sibling directory (../wuffs) git revision is 5767f030a37032c0f39eac0c89d8292238d358cf
-Manifest (sha512sum values, filenames, versions):
-4be987ec98507b4df36d9795510830a7f4890e1d14953f589028cfb5291b60c115bcf0f9db128d4980e31d7945145095ad86d4647f2668008ec282fdd3c70e52 release/c/README.md
-542abc35ca1b6112a2859ff6f89de6210590515c67551ac972da053e036f7e8c92953ee0d6b40c0555e536bde7d137058a2a4648e36916e1a763bbadfb192d64 release/c/wuffs-v0.2.c
+script/sync.sh ran on 2021-03-14
+Sibling directory (../wuffs) git revision is 3e5afc3e527041defb11bfe3746d57b87cc62d32
+Manifest (sha256sum values, filenames, versions):
+44756ef81a9bbe945c7667b3c76c6db44babd4db5692d93ca96b9b28a7d86fcb release/c/README.md
+3b6a0c78f663bb495d1972fbb2a87c717d70fbac5ea8cc1a50cb9afaa4b03f92 release/c/wuffs-v0.2.c
#define WUFFS_VERSION_STRING "0.2.0+2078.20191219"