Update CITATION to use bibentry

[seabbs]

As suggested by @Bisaloo in #236 this PR updates the CITATION file to make use of bibentry() as is currently recommended practice.

[codecov]

Codecov Report

Merging #237 (cd1e078) into develop (d21ab56) will decrease coverage by 0.05%.
The diff coverage is 97.29%.

❗ Current head cd1e078 differs from pull request most recent head 98a59da. Consider uploading reports for the commit 98a59da to get more accurate results

@@             Coverage Diff             @@
##           develop     #237      +/-   ##
===========================================
- Coverage    97.31%   97.27%   -0.05%     
===========================================
  Files           14       14              
  Lines         1527     1540      +13     
===========================================
+ Hits          1486     1498      +12     
- Misses          41       42       +1     

Impacted Files	Coverage Δ
R/formula-tools.R	95.00% <96.15%> (-0.24%)	⬇️
R/check.R	100.00% <100.00%> (ø)
R/model-design-tools.R	100.00% <100.00%> (ø)
R/model-tools.R	99.20% <100.00%> (ø)
R/preprocess.R	96.44% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[seabbs]

👯‍♂️