Remove spaces around infix operator ^

[dchiu911]

• Fix unit test since ** is interpreted as ^ in the R parser
• Completes Don't add spaces to ^ infix operator #303

[codecov]

Codecov Report

Merging #321 into master will decrease coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
- Coverage   85.52%   85.41%   -0.11%     
==========================================
  Files          40       40              
  Lines        2238     2098     -140     
==========================================
- Hits         1914     1792     -122     
+ Misses        324      306      -18

Impacted Files	Coverage Δ
R/infix_spaces_linter.R	100% <ø> (ø)	⬆️
R/utils.R	73.86% <0%> (-2.84%)	⬇️
R/seq_linter.R	97.43% <0%> (-2.57%)	⬇️
R/lint.R	71.03% <0%> (-2.27%)	⬇️
R/settings.R	92.3% <0%> (-1.57%)	⬇️
R/tree-utils.R	83.87% <0%> (-1.21%)	⬇️
R/exclude.R	94.28% <0%> (-0.84%)	⬇️
R/methods.R	41.83% <0%> (-0.62%)	⬇️
R/extract.R	97.22% <0%> (-0.4%)	⬇️
R/object_usage_linter.R	90.12% <0%> (-0.36%)	⬇️
... and 11 more

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[gdequeiroz]

It looks great!