Fix DNS dialup detailed output in print.go

[tstraley]

This addresses a bug that had the default 'Details' output showing the total fastest and total slowest request times in the DNS dialup min / max categories.

[tstraley]

Example with fixed output:

$ ./bin/hey_linux http://google.co.nz

Summary:
Total: 0.5907 secs
Slowest: 0.2314 secs
Fastest: 0.0930 secs
Average: 0.1384 secs
Requests/sec: 338.5961

Response time histogram:
0.093 [1] |■
0.107 [17] |■■■■■■■■■■■
0.121 [63] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.135 [53] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.148 [11] |■■■■■■■
0.162 [5] |■■■
0.176 [13] |■■■■■■■■
0.190 [14] |■■■■■■■■■
0.204 [7] |■■■■
0.218 [10] |■■■■■■
0.231 [6] |■■■■

Latency distribution:
10% in 0.1107 secs
25% in 0.1167 secs
50% in 0.1240 secs
75% in 0.1628 secs
90% in 0.1937 secs
95% in 0.2127 secs
99% in 0.2275 secs

Details (average, fastest, slowest):
DNS+dialup: 0.0094 secs, 0.0000 secs, 0.0463 secs
DNS-lookup: 0.0052 secs, 0.0000 secs, 0.0290 secs
req write: 0.0001 secs, 0.0000 secs, 0.0003 secs
resp wait: 0.0749 secs, 0.0503 secs, 0.1155 secs
resp read: 0.0029 secs, 0.0008 secs, 0.0091 secs

Status code distribution:
[200] 200 responses

Notice that the Details section, DNS+dialup is now correct data relevant to the connection, rather than just a copy of the fastest and slowest requests (which is still presented in the summary).

FYI: looks like this bug was introduced in #97 when it moved from using ConnLats in the old print function to this current behavior.

[tstraley]

@rakyll is this repo still active? Any chance we can get some reviews on this tiny PR?