logical operators in square brace expression and line breaks

[lorenzwalthert]

Closes #563 and puts the code in same rule for efficiency.

Here is how the current PR would change benchmark results when merged into master:

• cache_applying: 0.03 -> 0.03 (-0.6%)
• cache_recording: 0.89 -> 0.89 (0.4%)
• without_cache: 2.6 -> 2.55 (-2%)

[codecov-io]

Codecov Report

Merging #709 (4dfb4ce) into master (e1688f5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #709   +/-   ##
=======================================
  Coverage   90.45%   90.46%           
=======================================
  Files          47       47           
  Lines        2253     2254    +1     
=======================================
+ Hits         2038     2039    +1     
  Misses        215      215           

Impacted Files	Coverage Δ
R/rules-line-breaks.R	100.00% <100.00%> (ø)
R/style-guides.R	100.00% <100.00%> (ø)

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