THRIFT-5684 upgrade to net7.0:
Client: netstd
Patch: Jens Geyer
diff --git a/build/docker/README.md b/build/docker/README.md
index a41f031..9635e6f 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -183,7 +183,7 @@
 | java      | 1.8.0\_191     | 17           |       |
 | js        | Node.js 6.17.1, V8 5.1.281.111, npm 3.10.10 | Node.js 10.18.0, V8 6.8.275.32, npm 6.13.4 |     |
 | lua       |               | 5.2.4         | Lua 5.3: see THRIFT-4386 |
-| netstd    | 6.0           | 6.0           |       |
+| netstd    | 7.0           | 7.0           |       |
 | nodejs    | 6.16.0        | 10.16.0       |       |
 | ocaml     |               | 4.05.0        | THRIFT-4517: ocaml 4.02.3 on xenial appears broken |
 | perl      | 5.22.1        | 5.26.1        |       |