Add coverage report to readme

Jan Breuer

2015-11-26 767a48d6239705de9a5417f15d459be6c2aaa0bc

 libscpi/src/units.c

@@ -283,7 +283,7 @@
            scpiLex_CharacterProgramData(&state, &token);

            /* convert string to special number type */
            SCPI_ParamToChoice(context, &token, special, &tag);
            result = SCPI_ParamToChoice(context, &token, special, &tag);

            value->special = TRUE;
            value->tag = tag;