CHANGES: Adds info about #51

Author: Felipe Zimmerle

CHANGES

@@ -1,6 +1,8 @@
 v3.0.x - YYYY-MMM-DD (To be released)
 -------------------------------------
 
+ - Fix libmodsecurity search in autoconf file.
+   [Issue #51 - @airween]
  - Fix: avoids crash if UNIQUE_ID is not set
    [Issue #46 - @Goron1606, @victorhora, @zimmerle]
  - Adds make install to the build system