Copybara import of the project:

--
8160f26e1a7f986cd5f322fa3a3e9e75b1290a08 by Mariusz Zaborski <oshogbo@invisiblethingslab.com>:

zopfli: fix a small typo
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/sandboxed-api/pull/137 from oshogbo:doc3 a80d3e728fd69319ce7167387a19b6dc9887c6c8
PiperOrigin-RevId: 435576465
Change-Id: Ia6b4e95e251b425edad4bca31baf9b65ae0809fd
diff --git a/contrib/README.md b/contrib/README.md
index b420df5..7f8060d 100644
--- a/contrib/README.md
+++ b/contrib/README.md
@@ -15,7 +15,7 @@
 `pffft/`     | PFFFT - a pretty fast Fourier Transform                           | [bitbucket.org/jpommier/pffft.git](https://bitbucket.org/jpommier/pffft.git)         | CMake
 `turbojpeg/` | High-level JPEG library                                           | [libjpeg-turbo.org/About/TurboJPEG](https://libjpeg-turbo.org/About/TurboJPEG)       | CMake
 `uriparser/` | uriparser - Strictly RFC 3986 compliant URI parsing and handling library | [github.com/uriparser/uriparser](https://github.com/uriparser/uriparser.git)         | CMake
-`zopfli`     | Zopfli - Compression Algorithm                                    | [github.com/google/zopfli](https://github.com/google/zopfli)                         | CMake
+`zopfli/`    | Zopfli - Compression Algorithm                                    | [github.com/google/zopfli](https://github.com/google/zopfli)                         | CMake
 `zstd/`      | Zstandard - Fast real-time compression algorithm                  | [github.com/facebook/zstd](https://github.com/facebook/zstd)                         | CMake
 
 ## Projects Shipping with Sandboxed API Sandboxes