Change in R parser makes styler fail on R devel

[lorenzwalthert]

Closes #582.

[codecov-io]

Codecov Report

Merging #583 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #583      +/-   ##
==========================================
+ Coverage    90.6%   90.67%   +0.06%     
==========================================
  Files          46       46              
  Lines        2044     2048       +4     
==========================================
+ Hits         1852     1857       +5     
+ Misses        192      191       -1

Impacted Files	Coverage Δ
R/environments.R	100% <100%> (ø)	⬆️
R/utils.R	80.76% <0%> (+3.84%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 91df2a3...178f8f3. Read the comment docs.

[lorenzwalthert]

I thought this one should fail but it does not: https://travis-ci.org/lorenzwalthert/styler/builds/645177749?utm_medium=notification&utm_source=github_status

Is R-devel outdated?