adds `as.character.formula()`

[jmbarbone]

Resolves #312 by adding export as.character.formula()

@klin333 would you be able to test your issue with this branch?

remotes::install_github("jmbarbone/openxlsx@312-as-character")

You should also get a natural warning when attaching a conflict:

library(openxlsx)
library(formula.tools)
#> Registered S3 method overwritten by 'formula.tools':
#>   method               from    
#>   as.character.formula openxlsx

^{Created on 2022-01-11 by the reprex package (v2.0.1)}

[codecov-commenter]

Codecov Report

Merging #315 (b153994) into master (f4bf841) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #315   +/-   ##
=======================================
  Coverage   67.70%   67.71%           
=======================================
  Files          34       34           
  Lines        8897     8898    +1     
=======================================
+ Hits         6024     6025    +1     
  Misses       2873     2873           

Impacted Files	Coverage Δ
R/writeData.R	88.39% <100.00%> (+0.06%)	:arrow_up:

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