Fix Changelog notation

Remove backticks, since ChangeLog is not in MarkDown
diff --git a/ChangeLog b/ChangeLog
index 80d4cf5..878b05f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -62,8 +62,8 @@
    * Fix issue in RSA key generation program programs/x509/rsa_genkey
      where the failure of CTR DRBG initialization lead to freeing an
      RSA context without proper initialization beforehand.
-   * Fix compilation error on Mingw32 when `_TRUNCATE` is defined. Use `_TRUNCATE`
-     only if `__MINGW32__` not defined. Fix suggested by Thomas Glanzmann and
+   * Fix compilation error on Mingw32 when _TRUNCATE is defined. Use _TRUNCATE
+     only if __MINGW32__ not defined. Fix suggested by Thomas Glanzmann and
      Nick Wilson on issue #355
 
 Changes