Escape ascii characters in queries

[boshek]

Closes #152

Old behaviour

library(httr2)
req <- request("http://example.com")

# Change url components
two_queries <- c("one", "two")
collapsed_query <- paste0(two_queries, collapse = ",")

## automatically converts , to %2
request("http://example.com") %>%
  req_url_query(q = I(collapsed_query))
#> <httr2_request>
#> GET http://example.com?q=one%2Ctwo
#> Body: empty

New behaviour

library(httr2)
req <- request("http://example.com")

# Change url components
two_queries <- c("one", "two")
collapsed_query <- paste0(two_queries, collapse = ",")

## automatically converts , to %2
request("http://example.com") %>%
  req_url_query(q = I(collapsed_query))
#> <httr2_request>
#> GET http://example.com?q=one,two
#> Body: empty

[hadley]

Thanks! I did a little tweaking of the code style, and I'll merge momentarily.

[boshek]

Great. Caught one little typo which of course kicked off the CI again.