Document fix for version 1.7.6

Author: iMichka

docs/history.rst

@@ -11,6 +11,11 @@ to python 3 (keeping it compatible with python 2).
 In Mai 2014, Michka Popoff and the Insight Software Consortium revived pygccxml
 by setting up a git repositery on github, hosted along with gccxml.
 
+Version 1.7.6
+-------------
+
+1. Fix problem with argument without names when building declaration string (#55)
+
 Version 1.7.5
 -------------