add ChaCha20Poly1305 test vectors from OpenSSL/RFC7539 (#3673)

* add ChaCha20Poly1305 test vectors from OpenSSL/RFC7539

* add the boringssl tests as well

* highlight the lines
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index a1d8b11..84aa30d 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -419,6 +419,8 @@
 * CAST5 (ECB) from :rfc:`2144`.
 * CAST5 (CBC, CFB, OFB) generated by this project.
   See: :doc:`/development/custom-vectors/cast5`
+* ChaCha20Poly1305 from :rfc:`7539`, `OpenSSL's evpciph.txt`_, and the
+  `BoringSSL ChaCha20Poly1305 tests`_.
 * IDEA (ECB) from the `NESSIE IDEA vectors`_ created by `NESSIE`_.
 * IDEA (CBC, CFB, OFB) generated by this project.
   See: :doc:`/development/custom-vectors/idea`
@@ -476,6 +478,8 @@
 .. _`Camellia page`: https://info.isl.ntt.co.jp/crypt/eng/camellia/
 .. _`CRYPTREC`: https://www.cryptrec.go.jp
 .. _`OpenSSL's test vectors`: https://github.com/openssl/openssl/blob/97cf1f6c2854a3a955fd7dd3a1f113deba00c9ef/crypto/evp/evptests.txt#L232
+.. _`OpenSSL's evpciph.txt`: https://github.com/openssl/openssl/blob/5a7bc0be97dee9ac715897fe8180a08e211bc6ea/test/evpciph.txt#L2362-L2403
+.. _`BoringSSL ChaCha20Poly1305 tests`: https://boringssl.googlesource.com/boringssl/+/2e2a226ac9201ac411a84b5e79ac3a7333d8e1c9/crypto/cipher_extra/test/chacha20_poly1305_tests.txt
 .. _`RIPEMD website`: https://homes.esat.kuleuven.be/~bosselae/ripemd160.html
 .. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
 .. _`draft RFC`: https://tools.ietf.org/html/draft-josefsson-scrypt-kdf-01