Add ChangeLog entry for Windows threading fix
diff --git a/ChangeLog b/ChangeLog
index 0a9dc4f..c4a3beb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,13 @@
= mbed TLS x.x.x branch released xxxx-xx-xx
+Changes
+ * Change the use of Windows threading to use Microsoft Visual C++ runtime
+ calls, rather than Win32 API calls directly. This is necessary to avoid
+ conflict with C runtime usage. Found and fixed by irwir.
+
+= mbed TLS 2.11.0 branch released 2018-06-18
+
Bugfix
* Fix failure in hmac_drbg in the benchmark sample application, when
MBEDTLS_THREADING_C is defined. Found by TrinityTonic, #1095