use magrittr 2.0

[lorenzwalthert]

Check how this affects speed. Local benchmarks showed ~ 8.1% diff (#664).

Let's see remote benchmarks

> (4 - 3.7) / 3.7
[1] 0.08108108

Ok, pretty close!

• cache_appyling: 0.031 -> 0.029 (-9%)
• cache_recording: 1.078 -> 0.966 (-10%)
• without_cache: 3.162 -> 2.834 (-10%)

[codecov-io]

Codecov Report

Merging #681 (59ca5e6) into master (c50338f) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #681      +/-   ##
==========================================
- Coverage   90.43%   90.41%   -0.02%     
==========================================
  Files          47       47              
  Lines        2226     2223       -3     
==========================================
- Hits         2013     2010       -3     
  Misses        213      213              

Impacted Files	Coverage Δ
R/set-assert-args.R	92.30% <0.00%> (-0.38%)	⬇️
R/utils-cache.R	100.00% <0.00%> (ø)
R/rules-line-break.R	100.00% <0.00%> (ø)

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