Merge pull request #5689 from yanesca/fix-lts-version-in-guidelines

Fix LTS version in contributing guidelines
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index aac526e..cea12f1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -52,10 +52,6 @@
 The list of maintained branches can be found in the [Current Branches section
 of BRANCHES.md](BRANCHES.md#current-branches).
 
-The only currently maintained LTS branch is:
-1. [mbedtls-2.16](https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-2.16)
-
-
 Tests
 -----
 As mentioned, tests that show the correctness of the feature or bug fix should be added to the pull request, if no such tests exist.