Fix s3write_using when there are opts

[patrick-miller]

The file argument tmp is created by tempfile() so rawConnectionValue does not work on it. This matches up with the rest of the S3 access functions, such as

r <- do.call("save_object", c(list(bucket = bucket, object = object, file = tmp), opts))

on line 63 of the same file.

Here is an example (pardon the non-standard approach to access/secret key management):

MYKEY <- Sys.getenv("AWS_ACCESS_KEY_ID")
MYSECRET <- Sys.getenv("AWS_SECRET_ACCESS_KEY")

bucket <- get_bucket("mybucket")  

s3write_using(x = iris, write.csv, object = "iris.csv",
  bucket = bucket, opts = list(key = MYKEY, secret = MYSECRET))

# This works
s3write_using(x = iris, write.csv, object = "iris.csv", bucket = bucket)

[codecov-io]

Codecov Report

Merging #205 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   20.94%   20.94%           
=======================================
  Files          32       32           
  Lines        1117     1117           
=======================================
  Hits          234      234           
  Misses        883      883

Impacted Files	Coverage Δ
R/s3read_using.R	0% <0%> (ø)	⬆️

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