Change logo url to from wlandau-lilly to ropensci

[wlandau-lilly]

Anticipates ropensci/software-review#156.

[codecov-io]

Codecov Report

Merging #176 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #176     +/-   ##
=======================================
  Coverage     100%   100%             
=======================================
  Files          62     63      +1     
  Lines        3962   5015   +1053     
=======================================
+ Hits         3962   5015   +1053

Impacted Files	Coverage Δ
R/distributed.R	100% <0%> (ø)	⬆️
R/predict_runtime.R	100% <0%> (ø)	⬆️
R/config.R	100% <0%> (ø)	⬆️
R/envir.R	100% <0%> (ø)	⬆️
R/store.R	100% <0%> (ø)	⬆️
R/build.R	100% <0%> (ø)	⬆️
R/strings.R	100% <0%> (ø)	⬆️
R/clean.R	100% <0%> (ø)	⬆️
R/meta.R	100% <0%> (ø)	⬆️
R/graph.R	100% <0%> (ø)	⬆️
... and 25 more

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[wlandau-lilly]

Merge conflicts and tests fail, but the images look fine. I'll probably just manually copy over the files in a commit to master. Then, I will need to change the rawgit.com link to the svg logo.