Fixed verb tense in change log.
Security
- * Fix a security reduction error that caused all bits of the nonce
- to be zero in mbedtls_ctr_drbg_reseed_internal. This prevented
+ * Fix a security reduction error that causes all bits of the nonce
+ to be zero in mbedtls_ctr_drbg_reseed_internal. This prevents
the security strength from reaching the level required by NIST.
Found by John Stroebel in #3819 and fixed in #3973.
