[PATCH v2] Allow use of TLS 1.3

[Loganaden Velvindron <logan@hackers.mu>]

Add a tlsv1.3 option to http.sslVersion in addition to the existing 
tlsv1.[012] options. libcurl has supported this since 7.52.0.

Done during IETF 101 Hackathon

Signed-off-by: Loganaden Velvindron <logan@hackers.mu>
---
 Documentation/config.txt | 2 +-
 http.c                   | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index ce9102cea..b18cb9104 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1957,7 +1957,7 @@ http.sslVersion::
 	- tlsv1.0
 	- tlsv1.1
 	- tlsv1.2
-
+	- tlsv1.3
 +
 Can be overridden by the `GIT_SSL_VERSION` environment variable.
 To force git to use libcurl's default ssl version and ignore any
diff --git a/http.c b/http.c
index a5bd5d62c..25eb84c11 100644
--- a/http.c
+++ b/http.c
@@ -62,6 +62,9 @@ static struct {
 	{ "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
 	{ "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
 #endif
+#ifdef CURL_SSLVERSION_TLSv1_3
+	{ "tlsv1.3", CURL_SSLVERSION_TLSv1_3 }
+#endif
 };
 #if LIBCURL_VERSION_NUM >= 0x070903
 static const char *ssl_key;
-- 
2.16.2