Revise Changelog to clarify and add credit
diff --git a/ChangeLog b/ChangeLog
index 865ea61..a217fa6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15,11 +15,8 @@
* Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found
by inestlerode. #559.
- * Fixed default threading implementation to avoid accidental double
- initialisations and double frees.
- * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
- builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found
- by inestlerode. #559.
+ * Fixed pthread implementation to avoid unintended double initialisations
+ and double frees. (found by Niklas Amnebratt)
= mbed TLS 2.1.5 branch released 2016-06-28