escape ampersand in argument while rewrite

src/core/ngx_string.c

diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index 8299134..a1aeb47 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -1278,13 +1278,13 @@
         0xffffffff  /* 1111 1111 1111 1111  1111 1111 1111 1111 */
     };
 
-                    /* " ", "#", "%", "+", "?", %00-%1F, %7F-%FF */
+                    /* " ", "#", "%", "&", "+", "?", %00-%1F, %7F-%FF */
 
     static uint32_t   args[] = {
         0xffffffff, /* 1111 1111 1111 1111  1111 1111 1111 1111 */
 
                     /* ?>=< ;:98 7654 3210  /.-, +*)( '&%$ #"!  */
-        0x80000829, /* 1000 0000 0000 0000  0000 1000 0010 1001 */
+        0x80000869, /* 1000 0000 0000 0000  0000 1000 0110 1001 */
 
                     /* _^]\ [ZYX WVUT SRQP  ONML KJIH GFED CBA@ */
         0x00000000, /* 0000 0000 0000 0000  0000 0000 0000 0000 */