add prototype

src/tools/StringUtils.h

@@ -14,6 +14,8 @@ const std::string getSchemeFromURL(const std::string &url);
 std::vector<std::string> split(const std::string &text, char sep);
 std::vector<std::string> parseSepButNotBetween(std::string string, std::string sep, std::vector<std::string> open, std::vector<std::string> close);
 
+bool in_array(std::string needle, std::vector<std::string> haystack);
+
 // from https://stackoverflow.com/a/25385766/7697705
 
 // trim from end of string (right)