Adds information about the pull request owasp-modsecurity#1060 on the CHANGES file

Author: Felipe Zimmerle

CHANGES

@@ -6,6 +6,8 @@
 03 Feb 2016 - 2.9.1-RC1
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+ * Treat APR_INCOMPLETE as APR_EOF while receiving the request body.
+   [Issue #1060, #334 - Alexey Sintsov]
  * Added support to generate audit logs in JSON format.
    [Issue #914, #897, #656 - Robert Paprocki]
  * Creating AuditLog serial file (or parallel index) respecting the