Fix clang -Wfloat-equal warning

cJSON.h

@@ -137,6 +137,11 @@ typedef int cJSON_bool;
 #define CJSON_NESTING_LIMIT 1000
 #endif
 
+/* Precision of double variables comparison */
+#ifndef CJSON_DOUBLE_PRECIION
+#define CJSON_DOUBLE_PRECIION .00001
+#endif
+
 /* returns the version of cJSON as a string */
 CJSON_PUBLIC(const char*) cJSON_Version(void);