removed unnecessary code (numbers must not begin with "+")

README.md

@@ -449,7 +449,7 @@ $ make
 $ ./json_unit "*"
 
 ===============================================================================
-All tests passed (5568703 assertions in 31 test cases)
+All tests passed (5568705 assertions in 31 test cases)
 ```
 
 For more information, have a look at the file [.travis.yml](https://github.com/nlohmann/json/blob/master/.travis.yml).

src/json.hpp

@@ -8448,10 +8448,6 @@ basic_json_parser_63:
             {
                 type = value_t::number_unsigned;
                 max = static_cast<uint64_t>(std::numeric_limits<number_unsigned_t>::max());
-                if (*curptr == '+')
-                {
-                    curptr++;
-                }
             }
 
             // count the significant figures

src/json.hpp.re2c

@@ -7758,10 +7758,6 @@ class basic_json
             {
                 type = value_t::number_unsigned;
                 max = static_cast<uint64_t>(std::numeric_limits<number_unsigned_t>::max());
-                if (*curptr == '+')
-                {
-                    curptr++;
-                }
             }
 
             // count the significant figures

test/unit.cpp

@@ -9776,6 +9776,10 @@ TEST_CASE("parser class")
                 CHECK_THROWS_AS(json::parser("-0e-:").parse(), std::invalid_argument);
                 CHECK_THROWS_AS(json::parser("-0f").parse(), std::invalid_argument);
 
+                // numbers must not begin with "+"
+                CHECK_THROWS_AS(json::parser("+1").parse(), std::invalid_argument);
+                CHECK_THROWS_AS(json::parser("+0").parse(), std::invalid_argument);
+
                 CHECK_THROWS_WITH(json::parser("01").parse(),
                                   "parse error - unexpected number literal; expected end of input");
                 CHECK_THROWS_WITH(json::parser("--1").parse(), "parse error - unexpected '-'");