Fix formatting in ChangeLog
diff --git a/ChangeLog b/ChangeLog
index 2fd2c34..7cc2cd4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,11 +3,11 @@
 = mbed TLS 2.x.x branch released xxxx-xx-xx
 
 Security
-    * Add checks to prevent signature forgeries for very large messages while
-      using RSA through the PK module in 64-bit systems. The issue was caused by
-      some data loss when casting a size_t to an unsigned int value in the
-      functions rsa_verify_wrap(), rsa_sign_wrap(), rsa_alt_sign_wrap() and
-      mbedtls_pk_sign(). Found by Jean-Philippe Aumasson.
+   * Add checks to prevent signature forgeries for very large messages while
+     using RSA through the PK module in 64-bit systems. The issue was caused by
+     some data loss when casting a size_t to an unsigned int value in the
+     functions rsa_verify_wrap(), rsa_sign_wrap(), rsa_alt_sign_wrap() and
+     mbedtls_pk_sign(). Found by Jean-Philippe Aumasson.
    * Removed MD5 from the allowed hash algorithms for CertificateRequest and
      CertificateVerify messages, to prevent SLOTH attacks against TLS 1.2.
      Introduced by interoperability fix for #513.